/*  Prototype JavaScript framework, version 1.6.0.2
*  (c) 2005-2008 Sam Stephenson
*
*  Prototype is freely distributable under the terms of an MIT-style license.
*  For details, see the Prototype web site: http://www.prototypejs.org/
*
*--------------------------------------------------------------------------*/

var Prototype = {
    Version: '1.6.0.3',

    Browser: {
        IE: !!(window.attachEvent &&
      navigator.userAgent.indexOf('Opera') === -1),
        Opera: navigator.userAgent.indexOf('Opera') > -1,
        WebKit: navigator.userAgent.indexOf('AppleWebKit/') > -1,
        Gecko: navigator.userAgent.indexOf('Gecko') > -1 &&
      navigator.userAgent.indexOf('KHTML') === -1,
        MobileSafari: !!navigator.userAgent.match(/Apple.*Mobile.*Safari/)
    },

    BrowserFeatures: {
        XPath: !!document.evaluate,
        SelectorsAPI: !!document.querySelector,
        ElementExtensions: !!window.HTMLElement,
        SpecificElementExtensions:
      document.createElement('div')['__proto__'] &&
      document.createElement('div')['__proto__'] !==
        document.createElement('form')['__proto__']
    },

    ScriptFragment: '<script[^>]*>([^\\x00]*?)<\/script>',
    JSONFilter: /^\/\*-secure-([\s\S]*)\*\/\s*$/,

    emptyFunction: function() { },
    K: function(x) { return x }
};

if (Prototype.Browser.MobileSafari)
    Prototype.BrowserFeatures.SpecificElementExtensions = false;


/* Based on Alex Arnell's inheritance implementation. */
var Class = {
    create: function()
    {
        var parent = null, properties = $A(arguments);
        if (Object.isFunction(properties[0]))
            parent = properties.shift();

        function klass()
        {
            this.initialize.apply(this, arguments);
        }

        Object.extend(klass, Class.Methods);
        klass.superclass = parent;
        klass.subclasses = [];

        if (parent)
        {
            var subclass = function() { };
            subclass.prototype = parent.prototype;
            klass.prototype = new subclass;
            parent.subclasses.push(klass);
        }

        for (var i = 0; i < properties.length; i++)
            klass.addMethods(properties[i]);

        if (!klass.prototype.initialize)
            klass.prototype.initialize = Prototype.emptyFunction;

        klass.prototype.constructor = klass;

        return klass;
    }
};

Class.Methods = {
    addMethods: function(source)
    {
        var ancestor = this.superclass && this.superclass.prototype;
        var properties = Object.keys(source);

        if (!Object.keys({ toString: true }).length)
            properties.push("toString", "valueOf");

        for (var i = 0, length = properties.length; i < length; i++)
        {
            var property = properties[i], value = source[property];
            if (ancestor && Object.isFunction(value) &&
          value.argumentNames().first() == "$super")
            {
                var method = value, value = (function(m)
                {
                    return function() { return ancestor[m].apply(this, arguments) };
                })(property).wrap(method);

                value.valueOf = method.valueOf.bind(method);
                value.toString = method.toString.bind(method);
            }
            this.prototype[property] = value;
        }

        return this;
    }
};

var Abstract = {};

Object.extend = function(destination, source)
{
    for (var property in source)
        destination[property] = source[property];
    return destination;
};

Object.extend(Object, {
    inspect: function(object)
    {
        try
        {
            if (Object.isUndefined(object)) return 'undefined';
            if (object === null) return 'null';
            return object.inspect ? object.inspect() : String(object);
        } catch (e)
        {
            if (e instanceof RangeError) return '...';
            throw e;
        }
    },

    toJSON: function(object)
    {
        var type = typeof object;
        switch (type)
        {
            case 'undefined':
            case 'function':
            case 'unknown': return;
            case 'boolean': return object.toString();
        }

        if (object === null) return 'null';
        if (object.toJSON) return object.toJSON();
        if (Object.isElement(object)) return;

        var results = [];
        for (var property in object)
        {
            var value = Object.toJSON(object[property]);
            if (!Object.isUndefined(value))
                results.push(property.toJSON() + ': ' + value);
        }

        return '{' + results.join(', ') + '}';
    },

    toQueryString: function(object)
    {
        return $H(object).toQueryString();
    },

    toHTML: function(object)
    {
        return object && object.toHTML ? object.toHTML() : String.interpret(object);
    },

    keys: function(object)
    {
        var keys = [];
        for (var property in object)
            keys.push(property);
        return keys;
    },

    values: function(object)
    {
        var values = [];
        for (var property in object)
            values.push(object[property]);
        return values;
    },

    clone: function(object)
    {
        return Object.extend({}, object);
    },

    isElement: function(object)
    {
        return !!(object && object.nodeType == 1);
    },

    isArray: function(object)
    {
        return object != null && typeof object == "object" &&
      'splice' in object && 'join' in object;
    },

    isHash: function(object)
    {
        return !!(object && object instanceof Hash);
    },

    isFunction: function(object)
    {
        return typeof object == "function" && typeof object.call == "function";
    },

    isString: function(object)
    {
        return typeof object == "string";
    },

    isNumber: function(object)
    {
        return typeof object == "number" && isFinite(object);
    },

    isUndefined: function(object)
    {
        return typeof object == "undefined";
    }
});

Object.extend(Function.prototype, {
    argumentNames: function()
    {
        var names = Function.prototype.toString.call(this)
     .match(/^[\s\(]*function[^(]*\(([^\)]*)\)/)[1]
     .replace(/\s+/g, '').split(',');
        return names.length == 1 && !names[0] ? [] : names;
    },

    bind: function()
    {
        if (arguments.length < 2 && Object.isUndefined(arguments[0])) return this;
        var __method = this, args = $A(arguments), object = args.shift();

        // Avoid using Array#concat when only the context argument is given.
        if (args.length)
        {
            return function()
            {
                return __method.apply(object, args.concat($A(arguments)));
            };
        }
        return function()
        {
            return __method.apply(object, arguments);
        };
    },

    bindAsEventListener: function()
    {
        var __method = this, args = $A(arguments), object = args.shift();

        // Avoid using Array#concat when only the context argument is given.
        if (args.length)
        {
            return function(event)
            {
                return __method.apply(object, [event || window.event].concat(args));
            };
        }
        return function(event)
        {
            return __method.apply(object, [event || window.event]);
        };
    },

    curry: function()
    {
        if (!arguments.length) return this;
        var __method = this, args = $A(arguments);
        return function()
        {
            return __method.apply(this, args.concat($A(arguments)));
        }
    },

    delay: function()
    {
        var __method = this, args = $A(arguments), timeout = args.shift() * 1000;
        return window.setTimeout(function()
        {
            return __method.apply(__method, args);
        }, timeout);
    },

    defer: function()
    {
        var args = [0.01].concat($A(arguments));
        return this.delay.apply(this, args);
    },

    wrap: function(wrapper)
    {
        var __method = this;
        return function()
        {
            return wrapper.apply(this, [__method.bind(this)].concat($A(arguments)));
        }
    },

    methodize: function()
    {
        if (this._methodized) return this._methodized;
        var __method = this;
        return this._methodized = function()
        {
            return __method.apply(null, [this].concat($A(arguments)));
        };
    }
});

Date.prototype.toJSON = function()
{
    return '"' + this.getUTCFullYear() + '-' +
    (this.getUTCMonth() + 1).toPaddedString(2) + '-' +
    this.getUTCDate().toPaddedString(2) + 'T' +
    this.getUTCHours().toPaddedString(2) + ':' +
    this.getUTCMinutes().toPaddedString(2) + ':' +
    this.getUTCSeconds().toPaddedString(2) + 'Z"';
};

var Try = {
    these: function()
    {
        var returnValue;

        for (var i = 0, length = arguments.length; i < length; i++)
        {
            var lambda = arguments[i];
            try
            {
                returnValue = lambda();
                break;
            } catch (e) { }
        }

        return returnValue;
    }
};

RegExp.prototype.match = RegExp.prototype.test;

RegExp.escape = function(str)
{
    return String(str).replace(/([.*+?^=!:${}()|[\]\/\\])/g, '\\$1');
};

/*--------------------------------------------------------------------------*/

var PeriodicalExecuter = Class.create({
    initialize: function(callback, frequency)
    {
        this.callback = callback;
        this.frequency = frequency;
        this.currentlyExecuting = false;

        this.registerCallback();
    },

    registerCallback: function()
    {
        this.timer = setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
    },

    execute: function()
    {
        this.callback(this);
    },

    stop: function()
    {
        if (!this.timer) return;
        clearInterval(this.timer);
        this.timer = null;
    },

    onTimerEvent: function()
    {
        if (!this.currentlyExecuting)
        {
            try
            {
                this.currentlyExecuting = true;
                this.execute();
            } finally
            {
                this.currentlyExecuting = false;
            }
        }
    }
});
Object.extend(String, {
    interpret: function(value)
    {
        return value == null ? '' : String(value);
    },
    specialChar: {
        '\b': '\\b',
        '\t': '\\t',
        '\n': '\\n',
        '\f': '\\f',
        '\r': '\\r',
        '\\': '\\\\'
    }
});

Object.extend(String.prototype, {
    gsub: function(pattern, replacement)
    {
        var result = '', source = this, match;
        replacement = arguments.callee.prepareReplacement(replacement);

        while (source.length > 0)
        {
            if (match = source.match(pattern))
            {
                result += source.slice(0, match.index);
                result += String.interpret(replacement(match));
                source = source.slice(match.index + match[0].length);
            } else
            {
                result += source, source = '';
            }
        }
        return result;
    },

    sub: function(pattern, replacement, count)
    {
        replacement = this.gsub.prepareReplacement(replacement);
        count = Object.isUndefined(count) ? 1 : count;

        return this.gsub(pattern, function(match)
        {
            if (--count < 0) return match[0];
            return replacement(match);
        });
    },

    scan: function(pattern, iterator)
    {
        this.gsub(pattern, iterator);
        return String(this);
    },

    truncate: function(length, truncation)
    {
        length = length || 30;
        truncation = Object.isUndefined(truncation) ? '...' : truncation;
        return this.length > length ?
      this.slice(0, length - truncation.length) + truncation : String(this);
    },

    strip: function()
    {
        return this.replace(/^\s+/, '').replace(/\s+$/, '');
    },

    stripTags: function()
    {
        return this.replace(/<\/?[^>]+>/gi, '');
    },

    stripScripts: function()
    {
        return this.replace(new RegExp(Prototype.ScriptFragment, 'img'), '');
    },

    extractScripts: (function()
    {
        var matchAll = new RegExp(Prototype.ScriptFragment, 'ig');
        var matchOne = new RegExp(Prototype.ScriptFragment, 'i');
        var matchComments = new RegExp('<!--\\s*' + Prototype.ScriptFragment + '\\s*-->', 'i');

        return function()
        {
            if (this.indexOf('<script') == -1) return [];
            return (this.replace(matchComments, '').match(matchAll) || []).map(function(scriptTag)
            {
                return (scriptTag.match(matchOne) || ['', ''])[1];
            });
        }
    })(),

    evalScripts: function()
    {
        return this.extractScripts().map(function(script) { return eval(script) });
    },

    escapeHTML: function()
    {
        var self = arguments.callee;
        self.text.data = this;
        return self.container.innerHTML.replace(/"/g, '&quot;');
    },

    unescapeHTML: function()
    {
        var div = document.createElement('div');
        // Safari requires the text nested inside another element to render correctly
        div.innerHTML = '<pre>' + this.stripTags() + '</pre>';
        div = div.firstChild;
        return div.childNodes[0] ? (div.childNodes.length > 1 ?
      $A(div.childNodes).inject('', function(memo, node) { return memo + node.nodeValue }) :
      div.childNodes[0].nodeValue) : '';
    },

    toQueryParams: function(separator)
    {
        var match = this.strip().match(/([^?#]*)(#.*)?$/);
        if (!match) return {};

        return match[1].split(separator || '&').inject({}, function(hash, pair)
        {
            if ((pair = pair.split('='))[0])
            {
                var key = decodeURIComponent(pair.shift());
                var value = pair.length > 1 ? pair.join('=') : pair[0];
                if (value != undefined) value = decodeURIComponent(value);

                if (key in hash)
                {
                    if (!Object.isArray(hash[key])) hash[key] = [hash[key]];
                    hash[key].push(value);
                }
                else hash[key] = value;
            }
            return hash;
        });
    },

    toArray: function()
    {
        return this.split('');
    },

    succ: function()
    {
        return this.slice(0, this.length - 1) +
      String.fromCharCode(this.charCodeAt(this.length - 1) + 1);
    },

    times: function(count)
    {
        return count < 1 ? '' : new Array(count + 1).join(this);
    },

    camelize: function()
    {
        var parts = this.split('-'), len = parts.length;
        if (len == 1) return parts[0];

        var camelized = this.charAt(0) == '-'
      ? parts[0].charAt(0).toUpperCase() + parts[0].substring(1)
      : parts[0];

        for (var i = 1; i < len; i++)
            camelized += parts[i].charAt(0).toUpperCase() + parts[i].substring(1);

        return camelized;
    },

    capitalize: function()
    {
        return this.charAt(0).toUpperCase() + this.substring(1).toLowerCase();
    },

    underscore: function()
    {
        return this.gsub(/::/, '/').gsub(/([A-Z]+)([A-Z][a-z])/, '#{1}_#{2}').gsub(/([a-z\d])([A-Z])/, '#{1}_#{2}').gsub(/-/, '_').toLowerCase();
    },

    dasherize: function()
    {
        return this.gsub(/_/, '-');
    },

    inspect: function(useDoubleQuotes)
    {
        var escapedString = this.gsub(/[\x00-\x1f\\]/, function(match)
        {
            var character = String.specialChar[match[0]];
            return character ? character : '\\u00' + match[0].charCodeAt().toPaddedString(2, 16);
        });
        if (useDoubleQuotes) return '"' + escapedString.replace(/"/g, '\\"') + '"';
        return "'" + escapedString.replace(/'/g, '\\\'') + "'";
    },

    toJSON: function()
    {
        return this.inspect(true);
    },

    unfilterJSON: function(filter)
    {
        return this.sub(filter || Prototype.JSONFilter, '#{1}');
    },

    isJSON: function()
    {
        var str = this;
        if (str.blank()) return false;
        str = this.replace(/\\./g, '@').replace(/"[^"\\\n\r]*"/g, '');
        return (/^[,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]*$/).test(str);
    },

    evalJSON: function(sanitize)
    {
        var json = this.unfilterJSON();
        try
        {
            if (!sanitize || json.isJSON()) return eval('(' + json + ')');
        } catch (e) { }
        throw new SyntaxError('Badly formed JSON string: ' + this.inspect());
    },

    include: function(pattern)
    {
        return this.indexOf(pattern) > -1;
    },

    startsWith: function(pattern)
    {
        return this.indexOf(pattern) === 0;
    },

    endsWith: function(pattern)
    {
        var d = this.length - pattern.length;
        return d >= 0 && this.lastIndexOf(pattern) === d;
    },

    empty: function()
    {
        return this == '';
    },

    blank: function()
    {
        return /^\s*$/.test(this);
    },

    interpolate: function(object, pattern)
    {
        return new Template(this, pattern).evaluate(object);
    }
});

String.prototype.gsub.prepareReplacement = function(replacement)
{
    if (Object.isFunction(replacement)) return replacement;
    var template = new Template(replacement);
    return function(match) { return template.evaluate(match) };
};

String.prototype.parseQuery = String.prototype.toQueryParams;

Object.extend(String.prototype.escapeHTML, {
    container: document.createElement('pre'),
    text: document.createTextNode('')
});

String.prototype.escapeHTML.container.appendChild(
  String.prototype.escapeHTML.text);

if ('1\n2'.unescapeHTML() === '1\r2')
{
    // IE converts all newlines to carriage returns so we swap them back
    String.prototype.unescapeHTML = String.prototype.unescapeHTML.wrap(function(proceed)
    {
        return proceed().replace(/\r/g, '\n')
    });
}

if ('>'.escapeHTML() !== '&gt;')
{
    // Safari 3.x has issues with escaping the ">" character
    (function()
    {
        var escapeHTML = String.prototype.escapeHTML;
        Object.extend(
      String.prototype.escapeHTML = escapeHTML.wrap(function(proceed)
      {
          return proceed().replace(/>/g, "&gt;")
      }), {
          container: escapeHTML.container,
          text: escapeHTML.text
      })
    })();
}

if ('&'.escapeHTML() !== '&amp;')
{
    // Safari 2.x has issues with escaping html inside a "pre" element so we use the deprecated "xmp" element instead
    Object.extend(String.prototype.escapeHTML, {
        container: document.createElement('xmp'),
        text: document.createTextNode('')
    });
    String.prototype.escapeHTML.container.appendChild(String.prototype.escapeHTML.text);
}

var Template = Class.create({
    initialize: function(template, pattern)
    {
        this.template = template.toString();
        this.pattern = pattern || Template.Pattern;
    },

    evaluate: function(object)
    {
        if (Object.isFunction(object.toTemplateReplacements))
            object = object.toTemplateReplacements();

        return this.template.gsub(this.pattern, function(match)
        {
            if (object == null) return '';

            var before = match[1] || '';
            if (before == '\\') return match[2];

            var ctx = object, expr = match[3];
            var pattern = /^([^.[]+|\[((?:.*?[^\\])?)\])(\.|\[|$)/;
            match = pattern.exec(expr);
            if (match == null) return before;

            while (match != null)
            {
                var comp = match[1].startsWith('[') ? match[2].gsub('\\\\]', ']') : match[1];
                ctx = ctx[comp];
                if (null == ctx || '' == match[3]) break;
                expr = expr.substring('[' == match[3] ? match[1].length : match[0].length);
                match = pattern.exec(expr);
            }

            return before + String.interpret(ctx);
        });
    }
});
Template.Pattern = /(^|.|\r|\n)(#\{(.*?)\})/;

var $break = {};

var Enumerable = {
    each: function(iterator, context)
    {
        var index = 0;
        try
        {
            this._each(function(value)
            {
                iterator.call(context, value, index++);
            });
        } catch (e)
        {
            if (e != $break) throw e;
        }
        return this;
    },

    eachSlice: function(number, iterator, context)
    {
        var index = -number, slices = [], array = this.toArray();
        if (number < 1) return array;
        while ((index += number) < array.length)
            slices.push(array.slice(index, index + number));
        return slices.collect(iterator, context);
    },

    all: function(iterator, context)
    {
        iterator = iterator || Prototype.K;
        var result = true;
        this.each(function(value, index)
        {
            result = result && !!iterator.call(context, value, index);
            if (!result) throw $break;
        });
        return result;
    },

    any: function(iterator, context)
    {
        iterator = iterator || Prototype.K;
        var result = false;
        this.each(function(value, index)
        {
            if (result = !!iterator.call(context, value, index))
                throw $break;
        });
        return result;
    },

    collect: function(iterator, context)
    {
        iterator = iterator || Prototype.K;
        var results = [];
        this.each(function(value, index)
        {
            results.push(iterator.call(context, value, index));
        });
        return results;
    },

    detect: function(iterator, context)
    {
        var result;
        this.each(function(value, index)
        {
            if (iterator.call(context, value, index))
            {
                result = value;
                throw $break;
            }
        });
        return result;
    },

    findAll: function(iterator, context)
    {
        var results = [];
        this.each(function(value, index)
        {
            if (iterator.call(context, value, index))
                results.push(value);
        });
        return results;
    },

    grep: function(filter, iterator, context)
    {
        iterator = iterator || Prototype.K;
        var results = [];

        if (Object.isString(filter))
            filter = new RegExp(filter);

        this.each(function(value, index)
        {
            if (filter.match(value))
                results.push(iterator.call(context, value, index));
        });
        return results;
    },

    include: function(object)
    {
        if (Object.isFunction(this.indexOf))
            if (this.indexOf(object) != -1) return true;

        var found = false;
        this.each(function(value)
        {
            if (value == object)
            {
                found = true;
                throw $break;
            }
        });
        return found;
    },

    inGroupsOf: function(number, fillWith)
    {
        fillWith = Object.isUndefined(fillWith) ? null : fillWith;
        return this.eachSlice(number, function(slice)
        {
            while (slice.length < number) slice.push(fillWith);
            return slice;
        });
    },

    inject: function(memo, iterator, context)
    {
        this.each(function(value, index)
        {
            memo = iterator.call(context, memo, value, index);
        });
        return memo;
    },

    invoke: function(method)
    {
        var args = $A(arguments).slice(1);
        return this.map(function(value)
        {
            return value[method].apply(value, args);
        });
    },

    max: function(iterator, context)
    {
        iterator = iterator || Prototype.K;
        var result;
        this.each(function(value, index)
        {
            value = iterator.call(context, value, index);
            if (result == null || value >= result)
                result = value;
        });
        return result;
    },

    min: function(iterator, context)
    {
        iterator = iterator || Prototype.K;
        var result;
        this.each(function(value, index)
        {
            value = iterator.call(context, value, index);
            if (result == null || value < result)
                result = value;
        });
        return result;
    },

    partition: function(iterator, context)
    {
        iterator = iterator || Prototype.K;
        var trues = [], falses = [];
        this.each(function(value, index)
        {
            (iterator.call(context, value, index) ?
        trues : falses).push(value);
        });
        return [trues, falses];
    },

    pluck: function(property)
    {
        var results = [];
        this.each(function(value)
        {
            results.push(value[property]);
        });
        return results;
    },

    reject: function(iterator, context)
    {
        var results = [];
        this.each(function(value, index)
        {
            if (!iterator.call(context, value, index))
                results.push(value);
        });
        return results;
    },

    sortBy: function(iterator, context)
    {
        return this.map(function(value, index)
        {
            return {
                value: value,
                criteria: iterator.call(context, value, index)
            };
        }).sort(function(left, right)
        {
            var a = left.criteria, b = right.criteria;
            return a < b ? -1 : a > b ? 1 : 0;
        }).pluck('value');
    },

    toArray: function()
    {
        return this.map();
    },

    zip: function()
    {
        var iterator = Prototype.K, args = $A(arguments);
        if (Object.isFunction(args.last()))
            iterator = args.pop();

        var collections = [this].concat(args).map($A);
        return this.map(function(value, index)
        {
            return iterator(collections.pluck(index));
        });
    },

    size: function()
    {
        return this.toArray().length;
    },

    inspect: function()
    {
        return '#<Enumerable:' + this.toArray().inspect() + '>';
    }
};

Object.extend(Enumerable, {
    map: Enumerable.collect,
    find: Enumerable.detect,
    select: Enumerable.findAll,
    filter: Enumerable.findAll,
    member: Enumerable.include,
    entries: Enumerable.toArray,
    every: Enumerable.all,
    some: Enumerable.any
});
function $A(iterable)
{
    if (!iterable) return [];
    if (iterable.toArray) return iterable.toArray();
    var length = iterable.length || 0, results = new Array(length);
    while (length--) results[length] = iterable[length];
    return results;
}

if (Prototype.Browser.WebKit)
{
    $A = function(iterable)
    {
        if (!iterable) return [];
        // In Safari, only use the `toArray` method if it's not a NodeList.
        // A NodeList is a function, has an function `item` property, and a numeric
        // `length` property. Adapted from Google Doctype.
        if (!(typeof iterable === 'function' && typeof iterable.length ===
        'number' && typeof iterable.item === 'function') && iterable.toArray)
            return iterable.toArray();
        var length = iterable.length || 0, results = new Array(length);
        while (length--) results[length] = iterable[length];
        return results;
    };
}

Array.from = $A;

Object.extend(Array.prototype, Enumerable);

if (!Array.prototype._reverse) Array.prototype._reverse = Array.prototype.reverse;

Object.extend(Array.prototype, {
    _each: function(iterator)
    {
        for (var i = 0, length = this.length; i < length; i++)
            iterator(this[i]);
    },

    clear: function()
    {
        this.length = 0;
        return this;
    },

    first: function()
    {
        return this[0];
    },

    last: function()
    {
        return this[this.length - 1];
    },

    compact: function()
    {
        return this.select(function(value)
        {
            return value != null;
        });
    },

    flatten: function()
    {
        return this.inject([], function(array, value)
        {
            return array.concat(Object.isArray(value) ?
        value.flatten() : [value]);
        });
    },

    without: function()
    {
        var values = $A(arguments);
        return this.select(function(value)
        {
            return !values.include(value);
        });
    },

    reverse: function(inline)
    {
        return (inline !== false ? this : this.toArray())._reverse();
    },

    reduce: function()
    {
        return this.length > 1 ? this : this[0];
    },

    uniq: function(sorted)
    {
        return this.inject([], function(array, value, index)
        {
            if (0 == index || (sorted ? array.last() != value : !array.include(value)))
                array.push(value);
            return array;
        });
    },

    intersect: function(array)
    {
        var length = array.length, i;
        return this.uniq().findAll(function(item)
        {
            i = length;
            while (i--) if (item === array[i]) return true;
            return false;
        });
    },

    clone: function()
    {
        return [].concat(this);
    },

    size: function()
    {
        return this.length;
    },

    inspect: function()
    {
        return '[' + this.map(Object.inspect).join(', ') + ']';
    },

    toJSON: function()
    {
        var results = [];
        this.each(function(object)
        {
            var value = Object.toJSON(object);
            if (!Object.isUndefined(value)) results.push(value);
        });
        return '[' + results.join(', ') + ']';
    }
});

// use native browser JS 1.6 implementation if available
if (Object.isFunction(Array.prototype.forEach))
    Array.prototype._each = Array.prototype.forEach;

if (!Array.prototype.indexOf) Array.prototype.indexOf = function(item, i)
{
    i || (i = 0);
    var length = this.length;
    if (i < 0) i = length + i;
    for (; i < length; i++)
        if (this[i] === item) return i;
    return -1;
};

if (!Array.prototype.lastIndexOf) Array.prototype.lastIndexOf = function(item, i)
{
    i = isNaN(i) ? this.length : (i < 0 ? this.length + i : i) + 1;
    var n = this.slice(0, i).reverse().indexOf(item);
    return (n < 0) ? n : i - n - 1;
};

Array.prototype.toArray = Array.prototype.clone;

function $w(string)
{
    if (!Object.isString(string)) return [];
    string = string.strip();
    return string ? string.split(/\s+/) : [];
}

if (Prototype.Browser.Opera)
{
    Array.prototype.concat = function()
    {
        var array = [];
        for (var i = 0, length = this.length; i < length; i++) array.push(this[i]);
        for (var i = 0, length = arguments.length; i < length; i++)
        {
            if (Object.isArray(arguments[i]))
            {
                for (var j = 0, arrayLength = arguments[i].length; j < arrayLength; j++)
                    array.push(arguments[i][j]);
            } else
            {
                array.push(arguments[i]);
            }
        }
        return array;
    };
}
Object.extend(Number.prototype, {
    toColorPart: function()
    {
        return this.toPaddedString(2, 16);
    },

    succ: function()
    {
        return this + 1;
    },

    times: function(iterator, context)
    {
        $R(0, this, true).each(iterator, context);
        return this;
    },

    toPaddedString: function(length, radix)
    {
        var string = this.toString(radix || 10);
        return '0'.times(length - string.length) + string;
    },

    toJSON: function()
    {
        return isFinite(this) ? this.toString() : 'null';
    }
});

$w('abs round ceil floor').each(function(method)
{
    Number.prototype[method] = Math[method].methodize();
});
function $H(object)
{
    return new Hash(object);
};

var Hash = Class.create(Enumerable, (function()
{

    function toQueryPair(key, value)
    {
        if (Object.isUndefined(value)) return key;
        return key + '=' + encodeURIComponent(String.interpret(value));
    }

    return {
        initialize: function(object)
        {
            this._object = Object.isHash(object) ? object.toObject() : Object.clone(object);
        },

        _each: function(iterator)
        {
            for (var key in this._object)
            {
                var value = this._object[key], pair = [key, value];
                pair.key = key;
                pair.value = value;
                iterator(pair);
            }
        },

        set: function(key, value)
        {
            return this._object[key] = value;
        },

        get: function(key)
        {
            // simulating poorly supported hasOwnProperty
            if (this._object[key] !== Object.prototype[key])
                return this._object[key];
        },

        unset: function(key)
        {
            var value = this._object[key];
            delete this._object[key];
            return value;
        },

        toObject: function()
        {
            return Object.clone(this._object);
        },

        keys: function()
        {
            return this.pluck('key');
        },

        values: function()
        {
            return this.pluck('value');
        },

        index: function(value)
        {
            var match = this.detect(function(pair)
            {
                return pair.value === value;
            });
            return match && match.key;
        },

        merge: function(object)
        {
            return this.clone().update(object);
        },

        update: function(object)
        {
            return new Hash(object).inject(this, function(result, pair)
            {
                result.set(pair.key, pair.value);
                return result;
            });
        },

        toQueryString: function()
        {
            return this.inject([], function(results, pair)
            {
                var key = encodeURIComponent(pair.key), values = pair.value;

                if (values && typeof values == 'object')
                {
                    if (Object.isArray(values))
                        return results.concat(values.map(toQueryPair.curry(key)));
                } else results.push(toQueryPair(key, values));
                return results;
            }).join('&');
        },

        inspect: function()
        {
            return '#<Hash:{' + this.map(function(pair)
            {
                return pair.map(Object.inspect).join(': ');
            }).join(', ') + '}>';
        },

        toJSON: function()
        {
            return Object.toJSON(this.toObject());
        },

        clone: function()
        {
            return new Hash(this);
        }
    }
})());

Hash.prototype.toTemplateReplacements = Hash.prototype.toObject;
Hash.from = $H;
var ObjectRange = Class.create(Enumerable, {
    initialize: function(start, end, exclusive)
    {
        this.start = start;
        this.end = end;
        this.exclusive = exclusive;
    },

    _each: function(iterator)
    {
        var value = this.start;
        while (this.include(value))
        {
            iterator(value);
            value = value.succ();
        }
    },

    include: function(value)
    {
        if (value < this.start)
            return false;
        if (this.exclusive)
            return value < this.end;
        return value <= this.end;
    }
});

var $R = function(start, end, exclusive)
{
    return new ObjectRange(start, end, exclusive);
};

var Ajax = {
    getTransport: function()
    {
        return Try.these(
      function() { return new ActiveXObject('Msxml2.XMLHTTP') },
      function() { return new ActiveXObject('Microsoft.XMLHTTP') },
      function() { return new XMLHttpRequest() }
    ) || false;
    },

    activeRequestCount: 0
};

Ajax.Responders = {
    responders: [],

    _each: function(iterator)
    {
        this.responders._each(iterator);
    },

    register: function(responder)
    {
        if (!this.include(responder))
            this.responders.push(responder);
    },

    unregister: function(responder)
    {
        this.responders = this.responders.without(responder);
    },

    dispatch: function(callback, request, transport, json)
    {
        this.each(function(responder)
        {
            if (Object.isFunction(responder[callback]))
            {
                try
                {
                    responder[callback].apply(responder, [request, transport, json]);
                } catch (e) { }
            }
        });
    }
};

Object.extend(Ajax.Responders, Enumerable);

Ajax.Responders.register({
    onCreate: function() { Ajax.activeRequestCount++ },
    onComplete: function() { Ajax.activeRequestCount-- }
});

Ajax.Base = Class.create({
    initialize: function(options)
    {
        this.options = {
            method: 'post',
            asynchronous: true,
            contentType: 'application/x-www-form-urlencoded',
            encoding: 'UTF-8',
            parameters: '',
            evalJSON: true,
            evalJS: true
        };
        Object.extend(this.options, options || {});

        this.options.method = this.options.method.toLowerCase();

        if (Object.isString(this.options.parameters))
            this.options.parameters = this.options.parameters.toQueryParams();
        else if (Object.isHash(this.options.parameters))
            this.options.parameters = this.options.parameters.toObject();
    }
});

Ajax.Request = Class.create(Ajax.Base, {
    _complete: false,

    initialize: function($super, url, options)
    {
        $super(options);
        this.transport = Ajax.getTransport();
        this.request(url);
    },

    request: function(url)
    {
        this.url = url;
        this.method = this.options.method;
        var params = Object.clone(this.options.parameters);

        if (!['get', 'post'].include(this.method))
        {
            // simulate other verbs over post
            params['_method'] = this.method;
            this.method = 'post';
        }

        this.parameters = params;

        if (params = Object.toQueryString(params))
        {
            // when GET, append parameters to URL
            if (this.method == 'get')
                this.url += (this.url.include('?') ? '&' : '?') + params;
            else if (/Konqueror|Safari|KHTML/.test(navigator.userAgent))
                params += '&_=';
        }

        try
        {
            var response = new Ajax.Response(this);
            if (this.options.onCreate) this.options.onCreate(response);
            Ajax.Responders.dispatch('onCreate', this, response);

            this.transport.open(this.method.toUpperCase(), this.url,
        this.options.asynchronous);

            if (this.options.asynchronous) this.respondToReadyState.bind(this).defer(1);

            this.transport.onreadystatechange = this.onStateChange.bind(this);
            this.setRequestHeaders();

            this.body = this.method == 'post' ? (this.options.postBody || params) : null;
            this.transport.send(this.body);

            /* Force Firefox to handle ready state 4 for synchronous requests */
            if (!this.options.asynchronous && this.transport.overrideMimeType)
                this.onStateChange();

        }
        catch (e)
        {
            this.dispatchException(e);
        }
    },

    onStateChange: function()
    {
        var readyState = this.transport.readyState;
        if (readyState > 1 && !((readyState == 4) && this._complete))
            this.respondToReadyState(this.transport.readyState);
    },

    setRequestHeaders: function()
    {
        var headers = {
            'X-Requested-With': 'XMLHttpRequest',
            'X-Prototype-Version': Prototype.Version,
            'Accept': 'text/javascript, text/html, application/xml, text/xml, */*'
        };

        if (this.method == 'post')
        {
            headers['Content-type'] = this.options.contentType +
        (this.options.encoding ? '; charset=' + this.options.encoding : '');

            /* Force "Connection: close" for older Mozilla browsers to work
            * around a bug where XMLHttpRequest sends an incorrect
            * Content-length header. See Mozilla Bugzilla #246651.
            */
            if (this.transport.overrideMimeType &&
          (navigator.userAgent.match(/Gecko\/(\d{4})/) || [0, 2005])[1] < 2005)
                headers['Connection'] = 'close';
        }

        // user-defined headers
        if (typeof this.options.requestHeaders == 'object')
        {
            var extras = this.options.requestHeaders;

            if (Object.isFunction(extras.push))
                for (var i = 0, length = extras.length; i < length; i += 2)
                headers[extras[i]] = extras[i + 1];
            else
                $H(extras).each(function(pair) { headers[pair.key] = pair.value });
        }

        for (var name in headers)
            this.transport.setRequestHeader(name, headers[name]);
    },

    success: function()
    {
        var status = this.getStatus();
        return !status || (status >= 200 && status < 300);
    },

    getStatus: function()
    {
        try
        {
            return this.transport.status || 0;
        } catch (e) { return 0 }
    },

    respondToReadyState: function(readyState)
    {
        var state = Ajax.Request.Events[readyState], response = new Ajax.Response(this);

        if (state == 'Complete')
        {
            try
            {
                this._complete = true;
                (this.options['on' + response.status]
         || this.options['on' + (this.success() ? 'Success' : 'Failure')]
         || Prototype.emptyFunction)(response, response.headerJSON);
            } catch (e)
            {
                this.dispatchException(e);
            }

            var contentType = response.getHeader('Content-type');
            if (this.options.evalJS == 'force'
          || (this.options.evalJS && this.isSameOrigin() && contentType
          && contentType.match(/^\s*(text|application)\/(x-)?(java|ecma)script(;.*)?\s*$/i)))
                this.evalResponse();
        }

        try
        {
            (this.options['on' + state] || Prototype.emptyFunction)(response, response.headerJSON);
            Ajax.Responders.dispatch('on' + state, this, response, response.headerJSON);
        } catch (e)
        {
            this.dispatchException(e);
        }

        if (state == 'Complete')
        {
            // avoid memory leak in MSIE: clean up
            this.transport.onreadystatechange = Prototype.emptyFunction;
        }
    },

    isSameOrigin: function()
    {
        var m = this.url.match(/^\s*https?:\/\/[^\/]*/);
        return !m || (m[0] == '#{protocol}//#{domain}#{port}'.interpolate({
            protocol: location.protocol,
            domain: document.domain,
            port: location.port ? ':' + location.port : ''
        }));
    },

    getHeader: function(name)
    {
        try
        {
            return this.transport.getResponseHeader(name) || null;
        } catch (e) { return null }
    },

    evalResponse: function()
    {
        try
        {
            return eval((this.transport.responseText || '').unfilterJSON());
        } catch (e)
        {
            this.dispatchException(e);
        }
    },

    dispatchException: function(exception)
    {
        (this.options.onException || Prototype.emptyFunction)(this, exception);
        Ajax.Responders.dispatch('onException', this, exception);
    }
});

Ajax.Request.Events =
  ['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];

Ajax.Response = Class.create({
    initialize: function(request)
    {
        this.request = request;
        var transport = this.transport = request.transport,
        readyState = this.readyState = transport.readyState;

        if ((readyState > 2 && !Prototype.Browser.IE) || readyState == 4)
        {
            this.status = this.getStatus();
            this.statusText = this.getStatusText();
            this.responseText = String.interpret(transport.responseText);
            this.headerJSON = this._getHeaderJSON();
        }

        if (readyState == 4)
        {
            var xml = transport.responseXML;
            this.responseXML = Object.isUndefined(xml) ? null : xml;
            this.responseJSON = this._getResponseJSON();
        }
    },

    status: 0,
    statusText: '',

    getStatus: Ajax.Request.prototype.getStatus,

    getStatusText: function()
    {
        try
        {
            return this.transport.statusText || '';
        } catch (e) { return '' }
    },

    getHeader: Ajax.Request.prototype.getHeader,

    getAllHeaders: function()
    {
        try
        {
            return this.getAllResponseHeaders();
        } catch (e) { return null }
    },

    getResponseHeader: function(name)
    {
        return this.transport.getResponseHeader(name);
    },

    getAllResponseHeaders: function()
    {
        return this.transport.getAllResponseHeaders();
    },

    _getHeaderJSON: function()
    {
        var json = this.getHeader('X-JSON');
        if (!json) return null;
        json = decodeURIComponent(escape(json));
        try
        {
            return json.evalJSON(this.request.options.sanitizeJSON ||
        !this.request.isSameOrigin());
        } catch (e)
        {
            this.request.dispatchException(e);
        }
    },

    _getResponseJSON: function()
    {
        var options = this.request.options;
        if (!options.evalJSON || (options.evalJSON != 'force' &&
      !(this.getHeader('Content-type') || '').include('application/json')) ||
        this.responseText.blank())
            return null;
        try
        {
            return this.responseText.evalJSON(options.sanitizeJSON ||
        !this.request.isSameOrigin());
        } catch (e)
        {
            this.request.dispatchException(e);
        }
    }
});

Ajax.Updater = Class.create(Ajax.Request, {
    initialize: function($super, container, url, options)
    {
        this.container = {
            success: (container.success || container),
            failure: (container.failure || (container.success ? null : container))
        };

        options = Object.clone(options);
        var onComplete = options.onComplete;
        options.onComplete = (function(response, json)
        {
            this.updateContent(response.responseText);
            if (Object.isFunction(onComplete)) onComplete(response, json);
        }).bind(this);

        $super(url, options);
    },

    updateContent: function(responseText)
    {
        var receiver = this.container[this.success() ? 'success' : 'failure'],
     options = this.options;

        if (!options.evalScripts) responseText = responseText.stripScripts();

        if (receiver = $(receiver))
        {
            if (options.insertion)
            {
                if (Object.isString(options.insertion))
                {
                    var insertion = {}; insertion[options.insertion] = responseText;
                    receiver.insert(insertion);
                }
                else options.insertion(receiver, responseText);
            }
            else receiver.update(responseText);
        }
    }
});

Ajax.PeriodicalUpdater = Class.create(Ajax.Base, {
    initialize: function($super, container, url, options)
    {
        $super(options);
        this.onComplete = this.options.onComplete;

        this.frequency = (this.options.frequency || 2);
        this.decay = (this.options.decay || 1);

        this.updater = {};
        this.container = container;
        this.url = url;

        this.start();
    },

    start: function()
    {
        this.options.onComplete = this.updateComplete.bind(this);
        this.onTimerEvent();
    },

    stop: function()
    {
        this.updater.options.onComplete = undefined;
        clearTimeout(this.timer);
        (this.onComplete || Prototype.emptyFunction).apply(this, arguments);
    },

    updateComplete: function(response)
    {
        if (this.options.decay)
        {
            this.decay = (response.responseText == this.lastText ?
        this.decay * this.options.decay : 1);

            this.lastText = response.responseText;
        }
        this.timer = this.onTimerEvent.bind(this).delay(this.decay * this.frequency);
    },

    onTimerEvent: function()
    {
        this.updater = new Ajax.Updater(this.container, this.url, this.options);
    }
});
function $(element)
{
    if (arguments.length > 1)
    {
        for (var i = 0, elements = [], length = arguments.length; i < length; i++)
            elements.push($(arguments[i]));
        return elements;
    }
    if (Object.isString(element))
        element = document.getElementById(element);
    return Element.extend(element);
}

if (Prototype.BrowserFeatures.XPath)
{
    document._getElementsByXPath = function(expression, parentElement)
    {
        var results = [];
        var query = document.evaluate(expression, $(parentElement) || document,
      null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
        for (var i = 0, length = query.snapshotLength; i < length; i++)
            results.push(Element.extend(query.snapshotItem(i)));
        return results;
    };
}

/*--------------------------------------------------------------------------*/

if (!window.Node) var Node = {};

if (!Node.ELEMENT_NODE)
{
    // DOM level 2 ECMAScript Language Binding
    Object.extend(Node, {
        ELEMENT_NODE: 1,
        ATTRIBUTE_NODE: 2,
        TEXT_NODE: 3,
        CDATA_SECTION_NODE: 4,
        ENTITY_REFERENCE_NODE: 5,
        ENTITY_NODE: 6,
        PROCESSING_INSTRUCTION_NODE: 7,
        COMMENT_NODE: 8,
        DOCUMENT_NODE: 9,
        DOCUMENT_TYPE_NODE: 10,
        DOCUMENT_FRAGMENT_NODE: 11,
        NOTATION_NODE: 12
    });
}

(function()
{
    var element = this.Element;
    this.Element = function(tagName, attributes)
    {
        attributes = attributes || {};
        tagName = tagName.toLowerCase();
        var cache = Element.cache;
        if (Prototype.Browser.IE && (attributes.name || attributes.type))
        {
            tagName = '<' + tagName +
        (attributes.name ? ' name="' + attributes.name + '"' : '') +
          (attributes.type ? ' type="' + attributes.type + '"' : '') + '>';
            delete attributes.name; delete attributes.type;
            return Element.writeAttribute(document.createElement(tagName), attributes);
        }
        if (!cache[tagName]) cache[tagName] = Element.extend(document.createElement(tagName));
        return Element.writeAttribute(cache[tagName].cloneNode(false), attributes);
    };
    Object.extend(this.Element, element || {});
    if (element) this.Element.prototype = element.prototype;
}).call(window);

Element.cache = {};

Element.Methods = {
    visible: function(element)
    {
        return $(element).style.display != 'none';
    },

    toggle: function(element)
    {
        element = $(element);
        Element[Element.visible(element) ? 'hide' : 'show'](element);
        return element;
    },

    hide: function(element)
    {
        (element = $(element)).style.display = 'none';
        return element;
    },

    show: function(element)
    {
        (element = $(element)).style.display = '';
        return element;
    },

    remove: function(element)
    {
        element = $(element);
        element.parentNode.removeChild(element);
        return element;
    },

    update: function(element, content)
    {
        element = $(element);
        if (content && content.toElement) content = content.toElement();
        if (Object.isElement(content)) return element.update().insert(content);
        content = Object.toHTML(content);
        element.innerHTML = content.stripScripts();
        content.evalScripts.bind(content).defer();
        return element;
    },

    replace: function(element, content)
    {
        element = $(element);
        if (content && content.toElement) content = content.toElement();
        else if (!Object.isElement(content))
        {
            content = Object.toHTML(content);
            var range = element.ownerDocument.createRange();
            range.selectNode(element);
            content.evalScripts.bind(content).defer();
            content = range.createContextualFragment(content.stripScripts());
        }
        element.parentNode.replaceChild(content, element);
        return element;
    },

    insert: function(element, insertions)
    {
        element = $(element);

        if (Object.isString(insertions) || Object.isNumber(insertions) ||
        Object.isElement(insertions) || (insertions && (insertions.toElement || insertions.toHTML)))
            insertions = { bottom: insertions };

        var content, insert, tagName, childNodes;

        for (var position in insertions)
        {
            content = insertions[position];
            position = position.toLowerCase();
            insert = Element._insertionTranslations[position];

            if (content && content.toElement) content = content.toElement();
            if (Object.isElement(content))
            {
                insert(element, content);
                continue;
            }

            content = Object.toHTML(content);

            tagName = ((position == 'before' || position == 'after')
        ? element.parentNode : element).tagName.toUpperCase();

            childNodes = Element._getContentFromAnonymousElement(tagName, content.stripScripts());

            if (position == 'top' || position == 'after') childNodes.reverse();
            childNodes.each(insert.curry(element));

            content.evalScripts.bind(content).defer();
        }

        return element;
    },

    wrap: function(element, wrapper, attributes)
    {
        element = $(element);
        if (Object.isElement(wrapper))
            $(wrapper).writeAttribute(attributes || {});
        else if (Object.isString(wrapper)) wrapper = new Element(wrapper, attributes);
        else wrapper = new Element('div', wrapper);
        if (element.parentNode)
            element.parentNode.replaceChild(wrapper, element);
        wrapper.appendChild(element);
        return wrapper;
    },

    inspect: function(element)
    {
        element = $(element);
        var result = '<' + element.tagName.toLowerCase();
        $H({ 'id': 'id', 'className': 'class' }).each(function(pair)
        {
            var property = pair.first(), attribute = pair.last();
            var value = (element[property] || '').toString();
            if (value) result += ' ' + attribute + '=' + value.inspect(true);
        });
        return result + '>';
    },

    recursivelyCollect: function(element, property)
    {
        element = $(element);
        var elements = [];
        while (element = element[property])
            if (element.nodeType == 1)
            elements.push(Element.extend(element));
        return elements;
    },

    ancestors: function(element)
    {
        return $(element).recursivelyCollect('parentNode');
    },

    descendants: function(element)
    {
        return $(element).select("*");
    },

    firstDescendant: function(element)
    {
        element = $(element).firstChild;
        while (element && element.nodeType != 1) element = element.nextSibling;
        return $(element);
    },

    immediateDescendants: function(element)
    {
        if (!(element = $(element).firstChild)) return [];
        while (element && element.nodeType != 1) element = element.nextSibling;
        if (element) return [element].concat($(element).nextSiblings());
        return [];
    },

    previousSiblings: function(element)
    {
        return $(element).recursivelyCollect('previousSibling');
    },

    nextSiblings: function(element)
    {
        return $(element).recursivelyCollect('nextSibling');
    },

    siblings: function(element)
    {
        element = $(element);
        return element.previousSiblings().reverse().concat(element.nextSiblings());
    },

    match: function(element, selector)
    {
        if (Object.isString(selector))
            selector = new Selector(selector);
        return selector.match($(element));
    },

    up: function(element, expression, index)
    {
        element = $(element);
        if (arguments.length == 1) return $(element.parentNode);
        var ancestors = element.ancestors();
        return Object.isNumber(expression) ? ancestors[expression] :
      Selector.findElement(ancestors, expression, index);
    },

    down: function(element, expression, index)
    {
        element = $(element);
        if (arguments.length == 1) return element.firstDescendant();
        return Object.isNumber(expression) ? element.descendants()[expression] :
      Element.select(element, expression)[index || 0];
    },

    previous: function(element, expression, index)
    {
        element = $(element);
        if (arguments.length == 1) return $(Selector.handlers.previousElementSibling(element));
        var previousSiblings = element.previousSiblings();
        return Object.isNumber(expression) ? previousSiblings[expression] :
      Selector.findElement(previousSiblings, expression, index);
    },

    next: function(element, expression, index)
    {
        element = $(element);
        if (arguments.length == 1) return $(Selector.handlers.nextElementSibling(element));
        var nextSiblings = element.nextSiblings();
        return Object.isNumber(expression) ? nextSiblings[expression] :
      Selector.findElement(nextSiblings, expression, index);
    },

    select: function()
    {
        var args = $A(arguments), element = $(args.shift());
        return Selector.findChildElements(element, args);
    },

    adjacent: function()
    {
        var args = $A(arguments), element = $(args.shift());
        return Selector.findChildElements(element.parentNode, args).without(element);
    },

    identify: function(element)
    {
        element = $(element);
        var id = element.readAttribute('id'), self = arguments.callee;
        if (id) return id;
        do { id = 'anonymous_element_' + self.counter++ } while ($(id));
        element.writeAttribute('id', id);
        return id;
    },

    readAttribute: function(element, name)
    {
        element = $(element);
        var t = Element._attributeTranslations.read;
        if (t.names[name]) name = t.names[name];

        if (Prototype.Browser.IE)
        {
            // If we're reading from a form, avoid a conflict between an attribute
            // and a child name.
            var tagName = element.tagName.toUpperCase();
            if (tagName == 'FORM' &&
        !/^((child|parent)Node|(next|previous)Sibling)$/.test(name) &&
          element.children[name])
            {
                element = $(element.cloneNode(false));
            }
            if (tagName == 'IFRAME' && name == 'type')
                return element.getAttribute(name, 1);
            if (t.values[name])
                return t.values[name](element, name);
            if (name.include(':'))
            {
                return (!element.attributes || !element.attributes[name]) ? null :
         element.attributes[name].value;
            }
        } else if (t.values[name]) return t.values[name](element, name);

        return element.getAttribute(name);
    },

    writeAttribute: function(element, name, value)
    {
        element = $(element);
        var attributes = {}, t = Element._attributeTranslations.write;

        if (typeof name == 'object') attributes = name;
        else attributes[name] = Object.isUndefined(value) ? true : value;

        for (var attr in attributes)
        {
            name = t.names[attr] || attr;
            value = attributes[attr];
            if (t.values[name]) name = t.values[name](element, value);
            if (value === false || value === null)
                element.removeAttribute(name);
            else if (value === true)
                element.setAttribute(name, name);
            else element.setAttribute(name, value);
        }
        return element;
    },

    getHeight: function(element)
    {
        return $(element).getDimensions().height;
    },

    getWidth: function(element)
    {
        return $(element).getDimensions().width;
    },

    classNames: function(element)
    {
        return new Element.ClassNames(element);
    },

    hasClassName: function(element, className)
    {
        if (!(element = $(element))) return;
        var elementClassName = element.className;
        return (elementClassName.length > 0 && (elementClassName == className ||
      new RegExp("(^|\\s)" + className + "(\\s|$)").test(elementClassName)));
    },

    addClassName: function(element, className)
    {
        if (!(element = $(element))) return;
        if (!element.hasClassName(className))
            element.className += (element.className ? ' ' : '') + className;
        return element;
    },

    removeClassName: function(element, className)
    {
        if (!(element = $(element))) return;
        element.className = element.className.replace(
      new RegExp("(^|\\s+)" + className + "(\\s+|$)"), ' ').strip();
        return element;
    },

    toggleClassName: function(element, className)
    {
        if (!(element = $(element))) return;
        return element[element.hasClassName(className) ?
      'removeClassName' : 'addClassName'](className);
    },

    // removes whitespace-only text node children
    cleanWhitespace: function(element)
    {
        element = $(element);
        var node = element.firstChild;
        while (node)
        {
            var nextNode = node.nextSibling;
            if (node.nodeType == 3 && !/\S/.test(node.nodeValue))
                element.removeChild(node);
            node = nextNode;
        }
        return element;
    },

    empty: function(element)
    {
        return $(element).innerHTML.blank();
    },

    descendantOf: function(element, ancestor)
    {
        element = $(element), ancestor = $(ancestor);

        if (element.compareDocumentPosition)
            return (element.compareDocumentPosition(ancestor) & 8) === 8;

        if (ancestor.contains)
            return ancestor.contains(element) && ancestor !== element;

        while (element = element.parentNode)
            if (element == ancestor) return true;

        return false;
    },

    scrollTo: function(element)
    {
        element = $(element);
        var pos = element.cumulativeOffset();
        window.scrollTo(pos[0], pos[1]);
        return element;
    },

    getStyle: function(element, style)
    {
        element = $(element);
        style = style == 'float' ? 'cssFloat' : style.camelize();
        var value = element.style[style];
        if (!value || value == 'auto')
        {
            var css = document.defaultView.getComputedStyle(element, null);
            value = css ? css[style] : null;
        }
        if (style == 'opacity') return value ? parseFloat(value) : 1.0;
        return value == 'auto' ? null : value;
    },

    getOpacity: function(element)
    {
        return $(element).getStyle('opacity');
    },

    setStyle: function(element, styles)
    {
        element = $(element);
        var elementStyle = element.style, match;
        if (Object.isString(styles))
        {
            element.style.cssText += ';' + styles;
            return styles.include('opacity') ?
        element.setOpacity(styles.match(/opacity:\s*(\d?\.?\d*)/)[1]) : element;
        }
        for (var property in styles)
            if (property == 'opacity') element.setOpacity(styles[property]);
        else
            elementStyle[(property == 'float' || property == 'cssFloat') ?
          (Object.isUndefined(elementStyle.styleFloat) ? 'cssFloat' : 'styleFloat') :
            property] = styles[property];

        return element;
    },

    setOpacity: function(element, value)
    {
        element = $(element);
        element.style.opacity = (value == 1 || value === '') ? '' :
      (value < 0.00001) ? 0 : value;
        return element;
    },

    getDimensions: function(element)
    {
        element = $(element);
        var display = element.getStyle('display'),
     dimensions = { width: element.offsetWidth, height: element.offsetHeight };

        // All width and height properties return 0 on elements with display:none,
        // so show the element temporarily
        if (display === "none" || display === null ||
        dimensions.width === 0 || dimensions.height === 0)
        {
            var els = element.style,
       originalVisibility = els.visibility,
       originalPosition = els.position,
       originalDisplay = els.display;

            els.visibility = 'hidden';
            els.position = 'absolute';
            els.display = 'block';

            dimensions = { width: element.offsetWidth, height: element.offsetHeight };

            els.display = originalDisplay;
            els.position = originalPosition;
            els.visibility = originalVisibility;
        }

        return dimensions;
    },

    makePositioned: function(element)
    {
        element = $(element);
        var pos = Element.getStyle(element, 'position');
        if (pos == 'static' || !pos)
        {
            element._madePositioned = true;
            element.style.position = 'relative';
            // Opera returns the offset relative to the positioning context, when an
            // element is position relative but top and left have not been defined
            if (Prototype.Browser.Opera)
            {
                element.style.top = 0;
                element.style.left = 0;
            }
        }
        return element;
    },

    undoPositioned: function(element)
    {
        element = $(element);
        if (element._madePositioned)
        {
            element._madePositioned = undefined;
            element.style.position =
        element.style.top =
        element.style.left =
        element.style.bottom =
        element.style.right = '';
        }
        return element;
    },

    makeClipping: function(element)
    {
        element = $(element);
        if (element._overflow) return element;
        element._overflow = Element.getStyle(element, 'overflow') || 'auto';
        if (element._overflow !== 'hidden')
            element.style.overflow = 'hidden';
        return element;
    },

    undoClipping: function(element)
    {
        element = $(element);
        if (!element._overflow) return element;
        element.style.overflow = element._overflow == 'auto' ? '' : element._overflow;
        element._overflow = null;
        return element;
    },

    absolutize: function(element)
    {
        element = $(element);
        if (Element.getStyle(element, 'position') == 'absolute') return element;

        var offsets = Element.positionedOffset(element),
     dimensions = Element.getDimensions(element),
     top = offsets.top,
     left = offsets.left,
     width = dimensions.width,
     height = dimensions.height;

        Object.extend(element, {
            _originalLeft: left - parseFloat(element.style.left || 0),
            _originalTop: top - parseFloat(element.style.top || 0),
            _originalWidth: Element.getStyle(element, 'width'),
            _originalHeight: Element.getStyle(element, 'height'),
            _originalMarginTop: Element.getStyle(element, 'marginTop'),
            _originalMarginLeft: Element.getStyle(element, 'marginLeft')
        });

        Element.setStyle(element, {
            position: 'absolute',
            top: top + 'px',
            left: left + 'px',
            width: width + 'px',
            height: height + 'px',
            marginTop: '0px',
            marginLeft: '0px'
        });

        return element;
    },

    relativize: function(element)
    {
        element = $(element);
        if (Element.getStyle(element, 'position') === 'relative')
            return element;

        if (!element._originalTop)
        {
            /* fix bizarre IE position issue with empty elements */
            var isBuggy = element.outerHTML && element.innerHTML.blank();
            if (isBuggy) element.innerHTML = '\x00';

            Object.extend(element, {
                _originalTop: element.offsetTop || 0,
                _originalLeft: element.offsetLeft || 0,
                _originalWidth: Element.getStyle(element, 'width'),
                _originalHeight: Element.getStyle(element, 'height'),
                _originalMarginTop: Element.getStyle(element, 'marginTop'),
                _originalMarginLeft: Element.getStyle(element, 'marginLeft')
            });

            if (isBuggy) element.innerHTML = '';
        }

        Element.setStyle(element, {
            position: 'relative',
            width: element._originalWidth,
            height: element._originalHeight,
            marginTop: element._originalMarginTop,
            marginLeft: element._originalMarginLeft
        });

        var offsets = element.positionedOffset(),
     top = element._originalTop - offsets.top,
     left = element._originalLeft - offsets.left;

        var isAuto = /^(auto|)$/;
        if (!isAuto.test(element.style.top)) top += element._originalTop;
        if (!isAuto.test(element.style.left)) left += element._originalLeft;

        Element.setStyle(element, {
            top: top + 'px',
            left: left + 'px'
        });

        return element;
    },

    getOffsetParent: function(element)
    {
        element = $(element);

        // IE throws an error if the element is not in the document.
        if (element.sourceIndex < 1) return $(document.body);

        var op = element.offsetParent, docElement = document.documentElement;
        if (op && op !== docElement &&
     Element.getStyle(op, 'position') !== 'static')
        {
            return $(op);
        }

        while ((element = element.parentNode) && element !== docElement &&
     element !== document)
        {
            if (Element.getStyle(element, 'position') !== 'static')
                return $(element);
        }

        return $(document.body);
    }
};

Object.extend(Element.Methods, (function()
{
    function getNumericStyle(element, style)
    {
        return parseFloat(Element.getStyle(element, style)) || 0;
    }

    function getOffsetParent(element)
    {
        var op = Element.getOffsetParent(element);
        if (op === document.body &&
       (element.sourceIndex < 1 || !element.offsetParent ||
        element.offsetParent === document.documentElement))
        {
            return false;
        }
        if (element.sourceIndex > 0 &&
        element.offsetParent === document.documentElement)
        {
            return element.offsetParent;
        }
        return op;
    }

    function cloneDimension(element, source, dimension)
    {
        var style = {}, properties;

        if (dimension === 'height')
        {
            properties = $w('borderTopWidth marginTop paddingTop ' +
       'borderBottomWidth marginBottom paddingBottom');
        } else
        {
            properties = $w('borderLeftWidth marginLeft paddingLeft ' +
       'borderRightWidth marginRight paddingRight');
        }

        style[dimension] = Element.getDimensions(source)[dimension];

        // Adjust element border and padding for accurate dimensions and
        // margins for accurate position.
        for (var i = 0, property, value; property = properties[i]; i++)
        {
            if (property.include('margin'))
            {
                value = getNumericStyle(element, property);
                style[property] = value + (getNumericStyle(source, property) -
         value) + 'px';
            } else
            {
                value = getNumericStyle(source, property);
                style[property] = value + 'px';
                style[dimension] -= value;
            }
        }
        style[dimension] += 'px';
        Element.setStyle(element, style);
    }

    return {
        cumulativeScrollOffset: function(element)
        {
            element = $(element);
            var valueT = 0, valueL = 0, end = document;

            if (Prototype.Browser.Opera &&
       parseFloat(window.opera.version()) < 9.5 &&
       element !== document.body)
            {
                end = document.documentElement;
            }

            if (Element.getStyle(element, 'position') !== 'fixed')
            {
                while ((element = element.parentNode) &&
         element.nodeType === 1 && element !== end)
                {
                    if (Element.getStyle(element, 'position') === 'fixed') break;
                    valueT += element.scrollTop || 0;
                    valueL += element.scrollLeft || 0;
                }
            }
            return Element._returnOffset(valueL, valueT);
        },

        cumulativeOffset: function(element)
        {
            element = $(element);
            var valueT = 0, valueL = 0;
            do
            {
                valueT += element.offsetTop || 0;
                valueL += element.offsetLeft || 0;
            } while (element = getOffsetParent(element));

            return Element._returnOffset(valueL, valueT);
        },

        positionedOffset: function(element)
        {
            element = $(element);
            var valueT = 0, valueL = 0;
            do
            {
                valueT += element.offsetTop || 0;
                valueL += element.offsetLeft || 0;
                element = getOffsetParent(element);
            } while (element && element !== document.body &&
        Element.getStyle(element, 'position') === 'static');

            return Element._returnOffset(valueL, valueT);
        },

        viewportOffset: function(forElement)
        {
            forElement = $(forElement);
            var op, element = forElement, valueT = 0, valueL = 0;

            do
            {
                valueT += element.offsetTop || 0;
                valueL += element.offsetLeft || 0;

                // Safari fix
                op = getOffsetParent(element);
                if (op === document.body && Element.getStyle(element,
         'position') === 'absolute') break;
            } while (element = op);

            var scrollOffset = Element.cumulativeScrollOffset(forElement);
            valueT -= scrollOffset.top;
            valueL -= scrollOffset.left;

            return Element._returnOffset(valueL, valueT);
        },

        clonePosition: function(element, source)
        {
            element = $(element);
            source = $(source);
            var options = Object.extend({
                setLeft: true,
                setTop: true,
                setWidth: true,
                setHeight: true,
                offsetTop: 0,
                offsetLeft: 0
            }, arguments[2] || {});

            // find coordinate system to use
            // delta [0,0] will do fine with position: fixed elements;
            // position: absolute needs offsetParent deltas
            var parent, delta = [0, 0];
            if (Element.getStyle(element, 'position') == 'absolute')
            {
                parent = Element.getOffsetParent(element);
                delta = Element.viewportOffset(parent);
            }

            // correct by body offsets (fixes Safari)
            if (parent == document.body)
            {
                delta[0] -= document.body.offsetLeft;
                delta[1] -= document.body.offsetTop;
            }

            // find page position of source
            var p = Element.viewportOffset(source);

            // set dimensions and position
            if (options.setWidth) cloneDimension(element, source, 'width');
            if (options.setHeight) cloneDimension(element, source, 'height');
            if (options.setLeft)
                element.style.left = (p[0] - delta[0] + options.offsetLeft + 'px');
            if (options.setTop)
                element.style.top = (p[1] - delta[1] + options.offsetTop + 'px');

            return element;
        }
    };
})());

Element.Methods.identify.counter = 1;

Object.extend(Element.Methods, {
    getElementsBySelector: Element.Methods.select,
    childElements: Element.Methods.immediateDescendants
});

Element._attributeTranslations = {
    write: {
        names: {
            className: 'class',
            htmlFor: 'for'
        },
        values: {}
    },

    read: {
        names: {},
        values: {
            _flag: function(element, attribute)
            {
                return $(element).hasAttribute(attribute) ? attribute : null;
            }
        }
    }
};

(function(v)
{
    Object.extend(v, {
        disabled: v._flag,
        checked: v._flag,
        readonly: v._flag,
        multiple: v._flag
    });
})(Element._attributeTranslations.read.values);

if (Prototype.Browser.Opera)
{
    Element.Methods.getStyle = Element.Methods.getStyle.wrap(
    function(proceed, element, style)
    {
        switch (style)
        {
            case 'left': case 'top': case 'right': case 'bottom':
                if (proceed(element, 'position') === 'static') return null;
            case 'height': case 'width':
                // returns '0px' for hidden elements; we want it to return null
                if (!Element.visible(element)) return null;

                // returns the border-box dimensions rather than the content-box
                // dimensions, so we subtract padding and borders from the value
                var dim = parseInt(proceed(element, style), 10);

                if (dim !== element['offset' + style.capitalize()])
                    return dim + 'px';

                var properties;
                if (style === 'height')
                {
                    properties = ['border-top-width', 'padding-top',
             'padding-bottom', 'border-bottom-width'];
                }
                else
                {
                    properties = ['border-left-width', 'padding-left',
             'padding-right', 'border-right-width'];
                }
                return properties.inject(dim, function(memo, property)
                {
                    var val = proceed(element, property);
                    return val === null ? memo : memo - parseInt(val, 10);
                }) + 'px';
            default: return proceed(element, style);
        }
    }
  );

    Element.Methods.readAttribute = Element.Methods.readAttribute.wrap(
    function(proceed, element, attribute)
    {
        if (attribute === 'title') return $(element).title;
        return proceed(element, attribute);
    }
  );
}

else if (Prototype.Browser.IE)
{
    // IE doesn't report offsets correctly for static elements, so we change them
    // to "relative" to get the values, then change them back.
    $w('positionedOffset viewportOffset').each(function(method)
    {
        Element.Methods[method] = Element.Methods[method].wrap(
      function(proceed, element)
      {
          element = $(element);

          var position = Element.getStyle(element, 'position');
          if (position !== 'static') return proceed(element);

          // Trigger hasLayout on the offset parent so that IE6 reports
          // accurate offsetTop and offsetLeft values for position: fixed.
          var offsetParent = Element.getOffsetParent(element),
         style = { position: 'relative' };
          if (Element.getStyle(offsetParent, 'position') === 'fixed'
         && !offsetParent.currentStyle.hasLayout)
              style.zoom = '1';

          Element.setStyle(element, style);
          var value = proceed(element);
          element.style.position = position;
          return value;
      }
    );
    });

    Element.Methods.getStyle = function(element, style)
    {
        element = $(element);
        style = (style == 'float' || style == 'cssFloat') ? 'styleFloat' : style.camelize();
        var value = element.style[style];
        if (!value && element.currentStyle) value = element.currentStyle[style];

        if (style == 'opacity')
        {
            if (value = (element.getStyle('filter') || '').match(/alpha\(opacity=(.*)\)/))
                if (value[1]) return parseFloat(value[1]) / 100;
            return 1.0;
        }

        if (value == 'auto')
        {
            if ((style == 'width' || style == 'height') && (element.getStyle('display') != 'none'))
                return element['offset' + style.capitalize()] + 'px';
            return null;
        }
        return value;
    };

    Element.Methods.setOpacity = function(element, value)
    {
        function stripAlpha(filter)
        {
            return filter.replace(/alpha\([^\)]*\)/gi, '');
        }
        element = $(element);
        var currentStyle = element.currentStyle;
        if ((currentStyle && !currentStyle.hasLayout) ||
      (!currentStyle && element.style.zoom == 'normal'))
            element.style.zoom = 1;

        var filter = element.getStyle('filter'), style = element.style;
        if (value == 1 || value === '')
        {
            (filter = stripAlpha(filter)) ?
        style.filter = filter : style.removeAttribute('filter');
            return element;
        } else if (value < 0.00001) value = 0;
        style.filter = stripAlpha(filter) +
      'alpha(opacity=' + (value * 100) + ')';
        return element;
    };

    (function(t)
    {
        t.has = {};
        t.write.names = {};

        $w('cellPadding cellSpacing colSpan rowSpan vAlign dateTime accessKey ' +
       'tabIndex encType maxLength readOnly longDesc frameBorder').each(function(attr)
       {
           var lower = attr.toLowerCase();
           t.has[lower] = attr;
           t.read.names[lower] = attr;
           t.write.names[lower] = attr;
       });

        [t.write.names, t.read.names].each(function(n)
        {
            Object.extend(n, {
                'class': 'className',
                'for': 'htmlFor'
            });
        });
    })(Element._attributeTranslations);

    Object.extend(Element._attributeTranslations.read.values, {

        _getAttr: function(element, attribute)
        {
            return element.getAttribute(attribute, 2);
        },

        _getAttrNode: function(element, attribute)
        {
            var node = element.getAttributeNode(attribute);
            return node ? node.value : "";
        },

        _getEv: function(element, attribute)
        {
            attribute = element.getAttribute(attribute);
            return attribute ? attribute.toString().slice(23, -2) : null;
        },

        style: function(element)
        {
            return element.style.cssText.toLowerCase();
        },

        title: function(element)
        {
            return element.title;
        }
    });

    Object.extend(Element._attributeTranslations.write.values, {
        checked: function(element, value)
        {
            element.checked = !!value;
        },

        encType: function(element, value)
        {
            element.getAttributeNode('encType').value = value;
        },

        style: function(element, value)
        {
            element.style.cssText = value ? value : '';
        }
    });

    (function(v)
    {
        delete v.readonly;
        Object.extend(v, {
            href: v._getAttr,
            src: v._getAttr,
            type: v._getAttr,
            action: v._getAttrNode,
            onload: v._getEv,
            onunload: v._getEv,
            onclick: v._getEv,
            ondblclick: v._getEv,
            onmousedown: v._getEv,
            onmouseup: v._getEv,
            onmouseover: v._getEv,
            onmousemove: v._getEv,
            onmouseout: v._getEv,
            onfocus: v._getEv,
            onblur: v._getEv,
            onkeypress: v._getEv,
            onkeydown: v._getEv,
            onkeyup: v._getEv,
            onsubmit: v._getEv,
            onreset: v._getEv,
            onselect: v._getEv,
            onchange: v._getEv,
            readOnly: v._flag.wrap(function(proceed, element, attribute)
            {
                attribute = proceed(element, attribute);
                return attribute ? 'readonly' : null;
            })
        });
    })(Element._attributeTranslations.read.values);
}

else if (Prototype.Browser.Gecko && /rv:1\.8\.0/.test(navigator.userAgent))
{
    Element.Methods.setOpacity = function(element, value)
    {
        element = $(element);
        element.style.opacity = (value == 1) ? 0.999999 :
      (value === '') ? '' : (value < 0.00001) ? 0 : value;
        return element;
    };
}

else if (Prototype.Browser.WebKit)
{
    Element.Methods.setOpacity = function(element, value)
    {
        element = $(element);
        element.style.opacity = (value == 1 || value === '') ? '' :
      (value < 0.00001) ? 0 : value;

        if (value == 1)
            if (element.tagName.toUpperCase() == 'IMG' && element.width)
        {
            element.width++; element.width--;
        } else try
        {
            var n = document.createTextNode(' ');
            element.appendChild(n);
            element.removeChild(n);
        } catch (e) { }

        return element;
    };

    // Safari returns margins on body which is incorrect if the child is absolutely
    // positioned.  For performance reasons, redefine Element#cumulativeOffset for
    // KHTML/WebKit only.
    Element.Methods.cumulativeOffset = function(element)
    {
        element = $(element);
        var valueT = 0, valueL = 0;
        do
        {
            valueT += element.offsetTop || 0;
            valueL += element.offsetLeft || 0;
            if (element.offsetParent == document.body)
                if (Element.getStyle(element, 'position') == 'absolute') break;

            element = element.offsetParent;
        } while (element);

        return Element._returnOffset(valueL, valueT);
    };
}

if (Prototype.Browser.IE || Prototype.Browser.Opera)
{
    // IE and Opera are missing .innerHTML support for TABLE-related and SELECT elements
    Element.Methods.update = function(element, content)
    {
        element = $(element);

        if (content && content.toElement) content = content.toElement();
        if (Object.isElement(content)) return element.update().insert(content);

        content = Object.toHTML(content);
        var tagName = element.tagName.toUpperCase();

        if (tagName in Element._insertionTranslations.tags)
        {
            $A(element.childNodes).each(function(node) { element.removeChild(node) });
            Element._getContentFromAnonymousElement(tagName, content.stripScripts())
        .each(function(node) { element.appendChild(node) });
        }
        else element.innerHTML = content.stripScripts();

        content.evalScripts.bind(content).defer();
        return element;
    };
}

if (Prototype.Browser.IE)
{
    // Wrap Element#update to clean up event handlers on
    // newly-removed elements. Prevents memory leaks in IE.
    Element.Methods.update = Element.Methods.update.wrap(
    function(proceed, element, contents)
    {
        Element.select(element, '*').each(Event.stopObserving);
        return proceed(element, contents);
    }
  );
}

if ('outerHTML' in document.createElement('div'))
{
    Element.Methods.replace = function(element, content)
    {
        element = $(element);

        if (content && content.toElement) content = content.toElement();
        if (Object.isElement(content))
        {
            element.parentNode.replaceChild(content, element);
            return element;
        }

        content = Object.toHTML(content);
        var parent = element.parentNode, tagName = parent.tagName.toUpperCase();

        // Avoid outerHTML in IE because it incorrectly removes the replaced
        // elements' child nodes.
        if (Element._insertionTranslations.tags[tagName] || Prototype.Browser.IE)
        {
            var nextSibling = element.next();
            var fragments = Element._getContentFromAnonymousElement(tagName,
       content.stripScripts());
            parent.removeChild(element);
            if (nextSibling)
                fragments.each(function(node) { parent.insertBefore(node, nextSibling) });
            else
                fragments.each(function(node) { parent.appendChild(node) });
        }
        else element.outerHTML = content.stripScripts();

        content.evalScripts.bind(content).defer();
        return element;
    };
}

Element._returnOffset = function(l, t)
{
    var result = [l, t];
    result.left = l;
    result.top = t;
    return result;
};

Element._getContentFromAnonymousElement = function(tagName, html)
{
    var div = new Element('div'), t = Element._insertionTranslations.tags[tagName];
    if (t)
    {
        div.innerHTML = t[0] + html + t[1];
        t[2].times(function() { div = div.firstChild });
    } else div.innerHTML = html;
    return $A(div.childNodes);
};

Element._insertionTranslations = {
    before: function(element, node)
    {
        element.parentNode.insertBefore(node, element);
    },
    top: function(element, node)
    {
        element.insertBefore(node, element.firstChild);
    },
    bottom: function(element, node)
    {
        element.appendChild(node);
    },
    after: function(element, node)
    {
        element.parentNode.insertBefore(node, element.nextSibling);
    },
    tags: {
        TABLE: ['<table>', '</table>', 1],
        TBODY: ['<table><tbody>', '</tbody></table>', 2],
        TR: ['<table><tbody><tr>', '</tr></tbody></table>', 3],
        TD: ['<table><tbody><tr><td>', '</td></tr></tbody></table>', 4],
        SELECT: ['<select>', '</select>', 1]
    }
};

(function()
{
    Object.extend(this.tags, {
        THEAD: this.tags.TBODY,
        TFOOT: this.tags.TBODY,
        TH: this.tags.TD
    });
}).call(Element._insertionTranslations);

Element.Methods.Simulated = {
    // No use of $ in this function in order to keep things fast.
    // Used by the Selector class.
    hasAttribute: function(element, attribute)
    {
        attribute = Element._attributeTranslations.has[attribute] || attribute;
        var node = element.getAttributeNode(attribute);
        return !!(node && node.specified);
    }
};

Element.Methods.ByTag = {};

Object.extend(Element, Element.Methods);

if (!Prototype.BrowserFeatures.ElementExtensions &&
    document.createElement('div')['__proto__'])
{
    window.HTMLElement = {};
    window.HTMLElement.prototype = document.createElement('div')['__proto__'];
    Prototype.BrowserFeatures.ElementExtensions = true;
}

Element.extend = (function()
{
    if (Prototype.BrowserFeatures.SpecificElementExtensions)
        return Prototype.K;

    var Methods = {}, ByTag = Element.Methods.ByTag;

    var extend = Object.extend(function(element)
    {
        if (!element || element._extendedByPrototype ||
        element.nodeType != 1 || element === window) return element;

        // Filter out XML nodes in IE.
        if (!(element.ownerDocument || element).body) return element;

        var methods = Object.clone(Methods),
      tagName = element.tagName.toUpperCase(), property, value;

        // extend methods for specific tags
        if (ByTag[tagName]) Object.extend(methods, ByTag[tagName]);

        for (property in methods)
        {
            value = methods[property];
            if (Object.isFunction(value) && !(property in element))
                element[property] = value.methodize();
        }

        element._extendedByPrototype = Prototype.emptyFunction;
        return element;

    }, {
        refresh: function()
        {
            // extend methods for all tags (Safari doesn't need this)
            if (!Prototype.BrowserFeatures.ElementExtensions)
            {
                Object.extend(Methods, Element.Methods);
                Object.extend(Methods, Element.Methods.Simulated);
            }
        }
    });

    extend.refresh();
    return extend;
})();


// No use of $ in this function in order to keep things fast.
// Used by the Selector class.
Element.hasAttribute = function(element, attribute)
{
    if (element.hasAttribute) return element.hasAttribute(attribute);
    return Element.Methods.Simulated.hasAttribute(element, attribute);
};

Element.addMethods = function(methods)
{
    var F = Prototype.BrowserFeatures, T = Element.Methods.ByTag;

    if (!methods)
    {
        Object.extend(Form, Form.Methods);
        Object.extend(Form.Element, Form.Element.Methods);
        Object.extend(Element.Methods.ByTag, {
            "BUTTON": Object.clone(Form.Element.Methods),
            "FORM": Object.clone(Form.Methods),
            "INPUT": Object.clone(Form.Element.Methods),
            "SELECT": Object.clone(Form.Element.Methods),
            "TEXTAREA": Object.clone(Form.Element.Methods)
        });
    }

    if (arguments.length == 2)
    {
        var tagName = methods;
        methods = arguments[1];
    }

    if (!tagName) Object.extend(Element.Methods, methods || {});
    else
    {
        if (Object.isArray(tagName)) tagName.each(extend);
        else extend(tagName);
    }

    function extend(tagName)
    {
        tagName = tagName.toUpperCase();
        if (!Element.Methods.ByTag[tagName])
            Element.Methods.ByTag[tagName] = {};
        Object.extend(Element.Methods.ByTag[tagName], methods);
    }

    function copy(methods, destination, onlyIfAbsent)
    {
        onlyIfAbsent = onlyIfAbsent || false;
        for (var property in methods)
        {
            var value = methods[property];
            if (!Object.isFunction(value)) continue;
            if (!onlyIfAbsent || !(property in destination))
                destination[property] = value.methodize();
        }
    }

    function findDOMClass(tagName)
    {
        var klass;
        var trans = {
            "OPTGROUP": "OptGroup", "TEXTAREA": "TextArea", "P": "Paragraph",
            "FIELDSET": "FieldSet", "UL": "UList", "OL": "OList", "DL": "DList",
            "DIR": "Directory", "H1": "Heading", "H2": "Heading", "H3": "Heading",
            "H4": "Heading", "H5": "Heading", "H6": "Heading", "Q": "Quote",
            "INS": "Mod", "DEL": "Mod", "A": "Anchor", "IMG": "Image", "CAPTION":
      "TableCaption", "COL": "TableCol", "COLGROUP": "TableCol", "THEAD":
      "TableSection", "TFOOT": "TableSection", "TBODY": "TableSection", "TR":
      "TableRow", "TH": "TableCell", "TD": "TableCell", "FRAMESET":
      "FrameSet", "IFRAME": "IFrame"
        };
        if (trans[tagName]) klass = 'HTML' + trans[tagName] + 'Element';
        if (window[klass]) return window[klass];
        klass = 'HTML' + tagName + 'Element';
        if (window[klass]) return window[klass];
        klass = 'HTML' + tagName.capitalize() + 'Element';
        if (window[klass]) return window[klass];

        window[klass] = {};
        window[klass].prototype = document.createElement(tagName)['__proto__'];
        return window[klass];
    }

    if (F.ElementExtensions)
    {
        copy(Element.Methods, HTMLElement.prototype);
        copy(Element.Methods.Simulated, HTMLElement.prototype, true);
    }

    if (F.SpecificElementExtensions)
    {
        for (var tag in Element.Methods.ByTag)
        {
            var klass = findDOMClass(tag);
            if (Object.isUndefined(klass)) continue;
            copy(T[tag], klass.prototype);
        }
    }

    Object.extend(Element, Element.Methods);
    delete Element.ByTag;

    if (Element.extend.refresh) Element.extend.refresh();
    Element.cache = {};
};

document.viewport = {
    getDimensions: function()
    {
        var dimensions = {}, B = Prototype.Browser;
        $w('width height').each(function(d)
        {
            var D = d.capitalize();
            if (B.WebKit && !document.evaluate)
            {
                // Safari <3.0 needs self.innerWidth/Height
                dimensions[d] = self['inner' + D];
            } else if (B.Opera && parseFloat(window.opera.version()) < 9.5)
            {
                // Opera <9.5 needs document.body.clientWidth/Height
                dimensions[d] = document.body['client' + D]
            } else
            {
                dimensions[d] = document.documentElement['client' + D];
            }
        });
        return dimensions;
    },

    getWidth: function()
    {
        return this.getDimensions().width;
    },

    getHeight: function()
    {
        return this.getDimensions().height;
    },

    getScrollOffsets: function()
    {
        return Element._returnOffset(
      window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft,
      window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop);
    }
};
/* Portions of the Selector class are derived from Jack Slocum's DomQuery,
* part of YUI-Ext version 0.40, distributed under the terms of an MIT-style
* license.  Please see http://www.yui-ext.com/ for more information. */

var Selector = Class.create({
    initialize: function(expression)
    {
        this.expression = expression.strip();

        if (this.shouldUseSelectorsAPI())
        {
            this.mode = 'selectorsAPI';
        } else if (this.shouldUseXPath())
        {
            this.mode = 'xpath';
            this.compileXPathMatcher();
        } else
        {
            this.mode = "normal";
            this.compileMatcher();
        }

    },

    shouldUseXPath: function()
    {
        if (!Prototype.BrowserFeatures.XPath) return false;

        var e = this.expression;

        // Opera's XPath engine breaks down when selectors are too complex
        // (a regression in version 9.5)
        if (Prototype.Browser.Opera &&
     parseFloat(window.opera.version()) === 9.5)
            return false;

        // Safari 3 chokes on :*-of-type and :empty
        if (Prototype.Browser.WebKit &&
     (e.include("-of-type") || e.include(":empty")))
            return false;

        // XPath can't do namespaced attributes, nor can it read
        // the "checked" property from DOM nodes
        if ((/(\[[\w-]*?:|:checked)/).test(e))
            return false;

        return true;
    },

    shouldUseSelectorsAPI: function()
    {
        if (!Prototype.BrowserFeatures.SelectorsAPI) return false;

        if (!Selector._div) Selector._div = new Element('div');

        // Make sure the browser treats the selector as valid. Test on an
        // isolated element to minimize cost of this check.
        try
        {
            Selector._div.querySelector(this.expression);
        } catch (e)
        {
            return false;
        }

        return true;
    },

    compileMatcher: function()
    {
        var e = this.expression, ps = Selector.patterns, h = Selector.handlers,
        c = Selector.criteria, le, p, m;

        if (Selector._cache[e])
        {
            this.matcher = Selector._cache[e];
            return;
        }

        this.matcher = ["this.matcher = function(root) {",
                    "var r = root, h = Selector.handlers, c = false, n;"];

        while (e && le != e && (/\S/).test(e))
        {
            le = e;
            for (var i in ps)
            {
                p = ps[i];
                if (m = e.match(p))
                {
                    this.matcher.push(Object.isFunction(c[i]) ? c[i](m) :
            new Template(c[i]).evaluate(m));
                    e = e.replace(m[0], '');
                    break;
                }
            }
        }

        this.matcher.push("return h.unique(n);\n}");
        eval(this.matcher.join('\n'));
        Selector._cache[this.expression] = this.matcher;
    },

    compileXPathMatcher: function()
    {
        var e = this.expression, ps = Selector.patterns,
        x = Selector.xpath, le, m;

        if (Selector._cache[e])
        {
            this.xpath = Selector._cache[e]; return;
        }

        this.matcher = ['.//*'];
        while (e && le != e && (/\S/).test(e))
        {
            le = e;
            for (var i in ps)
            {
                if (m = e.match(ps[i]))
                {
                    this.matcher.push(Object.isFunction(x[i]) ? x[i](m) :
            new Template(x[i]).evaluate(m));
                    e = e.replace(m[0], '');
                    break;
                }
            }
        }

        this.xpath = this.matcher.join('');
        Selector._cache[this.expression] = this.xpath;
    },

    findElements: function(root)
    {
        root = root || document;
        var e = this.expression, results;

        switch (this.mode)
        {
            case 'selectorsAPI':
                // querySelectorAll queries document-wide, then filters to descendants
                // of the context element. That's not what we want.
                // Add an explicit context to the selector if necessary.
                if (root !== document)
                {
                    var oldId = root.id, id = $(root).identify();
                    e = "#" + id + " " + e;
                }

                results = $A(root.querySelectorAll(e)).map(Element.extend);
                root.id = oldId;

                return results;
            case 'xpath':
                return document._getElementsByXPath(this.xpath, root);
            default:
                return this.matcher(root);
        }
    },

    match: function(element)
    {
        this.tokens = [];

        var e = this.expression, ps = Selector.patterns, as = Selector.assertions;
        var le, p, m;

        while (e && le !== e && (/\S/).test(e))
        {
            le = e;
            for (var i in ps)
            {
                p = ps[i];
                if (m = e.match(p))
                {
                    // use the Selector.assertions methods unless the selector
                    // is too complex.
                    if (as[i])
                    {
                        this.tokens.push([i, Object.clone(m)]);
                        e = e.replace(m[0], '');
                    } else
                    {
                        // reluctantly do a document-wide search
                        // and look for a match in the array
                        return this.findElements(document).include(element);
                    }
                }
            }
        }

        var match = true, name, matches;
        for (var i = 0, token; token = this.tokens[i]; i++)
        {
            name = token[0], matches = token[1];
            if (!Selector.assertions[name](element, matches))
            {
                match = false; break;
            }
        }

        return match;
    },

    toString: function()
    {
        return this.expression;
    },

    inspect: function()
    {
        return "#<Selector:" + this.expression.inspect() + ">";
    }
});

Object.extend(Selector, {
    _cache: {},

    xpath: {
        descendant: "//*",
        child: "/*",
        adjacent: "/following-sibling::*[1]",
        laterSibling: '/following-sibling::*',
        tagName: function(m)
        {
            if (m[1] == '*') return '';
            return "[local-name()='" + m[1].toLowerCase() +
             "' or local-name()='" + m[1].toUpperCase() + "']";
        },
        className: "[contains(concat(' ', @class, ' '), ' #{1} ')]",
        id: "[@id='#{1}']",
        attrPresence: function(m)
        {
            m[1] = m[1].toLowerCase();
            return new Template("[@#{1}]").evaluate(m);
        },
        attr: function(m)
        {
            m[1] = m[1].toLowerCase();
            m[3] = m[5] || m[6];
            return new Template(Selector.xpath.operators[m[2]]).evaluate(m);
        },
        pseudo: function(m)
        {
            var h = Selector.xpath.pseudos[m[1]];
            if (!h) return '';
            if (Object.isFunction(h)) return h(m);
            return new Template(Selector.xpath.pseudos[m[1]]).evaluate(m);
        },
        operators: {
            '=': "[@#{1}='#{3}']",
            '!=': "[@#{1}!='#{3}']",
            '^=': "[starts-with(@#{1}, '#{3}')]",
            '$=': "[substring(@#{1}, (string-length(@#{1}) - string-length('#{3}') + 1))='#{3}']",
            '*=': "[contains(@#{1}, '#{3}')]",
            '~=': "[contains(concat(' ', @#{1}, ' '), ' #{3} ')]",
            '|=': "[contains(concat('-', @#{1}, '-'), '-#{3}-')]"
        },
        pseudos: {
            'first-child': '[not(preceding-sibling::*)]',
            'last-child': '[not(following-sibling::*)]',
            'only-child': '[not(preceding-sibling::* or following-sibling::*)]',
            'empty': "[count(*) = 0 and (count(text()) = 0)]",
            'checked': "[@checked]",
            'disabled': "[(@disabled) and (@type!='hidden')]",
            'enabled': "[not(@disabled) and (@type!='hidden')]",
            'not': function(m)
            {
                var e = m[6], p = Selector.patterns,
            x = Selector.xpath, le, v;

                var exclusion = [];
                while (e && le != e && (/\S/).test(e))
                {
                    le = e;
                    for (var i in p)
                    {
                        if (m = e.match(p[i]))
                        {
                            v = Object.isFunction(x[i]) ? x[i](m) : new Template(x[i]).evaluate(m);
                            exclusion.push("(" + v.substring(1, v.length - 1) + ")");
                            e = e.replace(m[0], '');
                            break;
                        }
                    }
                }
                return "[not(" + exclusion.join(" and ") + ")]";
            },
            'nth-child': function(m)
            {
                return Selector.xpath.pseudos.nth("(count(./preceding-sibling::*) + 1) ", m);
            },
            'nth-last-child': function(m)
            {
                return Selector.xpath.pseudos.nth("(count(./following-sibling::*) + 1) ", m);
            },
            'nth-of-type': function(m)
            {
                return Selector.xpath.pseudos.nth("position() ", m);
            },
            'nth-last-of-type': function(m)
            {
                return Selector.xpath.pseudos.nth("(last() + 1 - position()) ", m);
            },
            'first-of-type': function(m)
            {
                m[6] = "1"; return Selector.xpath.pseudos['nth-of-type'](m);
            },
            'last-of-type': function(m)
            {
                m[6] = "1"; return Selector.xpath.pseudos['nth-last-of-type'](m);
            },
            'only-of-type': function(m)
            {
                var p = Selector.xpath.pseudos; return p['first-of-type'](m) + p['last-of-type'](m);
            },
            nth: function(fragment, m)
            {
                var mm, formula = m[6], predicate;
                if (formula == 'even') formula = '2n+0';
                if (formula == 'odd') formula = '2n+1';
                if (mm = formula.match(/^(\d+)$/)) // digit only
                    return '[' + fragment + "= " + mm[1] + ']';
                if (mm = formula.match(/^(-?\d*)?n(([+-])(\d+))?/))
                { // an+b
                    if (mm[1] == "-") mm[1] = -1;
                    var a = mm[1] ? Number(mm[1]) : 1;
                    var b = mm[2] ? Number(mm[2]) : 0;
                    predicate = "[((#{fragment} - #{b}) mod #{a} = 0) and " +
          "((#{fragment} - #{b}) div #{a} >= 0)]";
                    return new Template(predicate).evaluate({
                        fragment: fragment, a: a, b: b
                    });
                }
            }
        }
    },

    criteria: {
        tagName: 'n = h.tagName(n, r, "#{1}", c);      c = false;',
        className: 'n = h.className(n, r, "#{1}", c);    c = false;',
        id: 'n = h.id(n, r, "#{1}", c);           c = false;',
        attrPresence: 'n = h.attrPresence(n, r, "#{1}", c); c = false;',
        attr: function(m)
        {
            m[3] = (m[5] || m[6]);
            return new Template('n = h.attr(n, r, "#{1}", "#{3}", "#{2}", c); c = false;').evaluate(m);
        },
        pseudo: function(m)
        {
            if (m[6]) m[6] = m[6].replace(/"/g, '\\"');
            return new Template('n = h.pseudo(n, "#{1}", "#{6}", r, c); c = false;').evaluate(m);
        },
        descendant: 'c = "descendant";',
        child: 'c = "child";',
        adjacent: 'c = "adjacent";',
        laterSibling: 'c = "laterSibling";'
    },

    patterns: {
        // combinators must be listed first
        // (and descendant needs to be last combinator)
        laterSibling: /^\s*~\s*/,
        child: /^\s*>\s*/,
        adjacent: /^\s*\+\s*/,
        descendant: /^\s/,

        // selectors follow
        tagName: /^\s*(\*|[\w\-]+)(\b|$)?/,
        id: /^#([\w\-\*]+)(\b|$)/,
        className: /^\.([\w\-\*]+)(\b|$)/,
        pseudo:
/^:((first|last|nth|nth-last|only)(-child|-of-type)|empty|checked|(en|dis)abled|not)(\((.*?)\))?(\b|$|(?=\s|[:+~>]))/,
        attrPresence: /^\[((?:[\w]+:)?[\w]+)\]/,
        attr: /\[((?:[\w-]*:)?[\w-]+)\s*(?:([!^$*~|]?=)\s*((['"])([^\4]*?)\4|([^'"][^\]]*?)))?\]/
    },

    // for Selector.match and Element#match
    assertions: {
        tagName: function(element, matches)
        {
            return matches[1].toUpperCase() == element.tagName.toUpperCase();
        },

        className: function(element, matches)
        {
            return Element.hasClassName(element, matches[1]);
        },

        id: function(element, matches)
        {
            return element.id === matches[1];
        },

        attrPresence: function(element, matches)
        {
            return Element.hasAttribute(element, matches[1]);
        },

        attr: function(element, matches)
        {
            var nodeValue = Element.readAttribute(element, matches[1]);
            return nodeValue && Selector.operators[matches[2]](nodeValue, matches[5] || matches[6]);
        }
    },

    handlers: {
        // UTILITY FUNCTIONS
        // joins two collections
        concat: function(a, b)
        {
            for (var i = 0, node; node = b[i]; i++)
                a.push(node);
            return a;
        },

        // marks an array of nodes for counting
        mark: function(nodes)
        {
            var _true = Prototype.emptyFunction;
            for (var i = 0, node; node = nodes[i]; i++)
                node._countedByPrototype = _true;
            return nodes;
        },

        unmark: function(nodes)
        {
            for (var i = 0, node; node = nodes[i]; i++)
                node._countedByPrototype = undefined;
            return nodes;
        },

        // mark each child node with its position (for nth calls)
        // "ofType" flag indicates whether we're indexing for nth-of-type
        // rather than nth-child
        index: function(parentNode, reverse, ofType)
        {
            parentNode._countedByPrototype = Prototype.emptyFunction;
            if (reverse)
            {
                for (var nodes = parentNode.childNodes, i = nodes.length - 1, j = 1; i >= 0; i--)
                {
                    var node = nodes[i];
                    if (node.nodeType == 1 && (!ofType || node._countedByPrototype)) node.nodeIndex = j++;
                }
            } else
            {
                for (var i = 0, j = 1, nodes = parentNode.childNodes; node = nodes[i]; i++)
                    if (node.nodeType == 1 && (!ofType || node._countedByPrototype)) node.nodeIndex = j++;
            }
        },

        // filters out duplicates and extends all nodes
        unique: function(nodes)
        {
            if (nodes.length == 0) return nodes;
            var results = [], n;
            for (var i = 0, l = nodes.length; i < l; i++)
                if (!(n = nodes[i])._countedByPrototype)
            {
                n._countedByPrototype = Prototype.emptyFunction;
                results.push(Element.extend(n));
            }
            return Selector.handlers.unmark(results);
        },

        // COMBINATOR FUNCTIONS
        descendant: function(nodes)
        {
            var h = Selector.handlers;
            for (var i = 0, results = [], node; node = nodes[i]; i++)
                h.concat(results, node.getElementsByTagName('*'));
            return results;
        },

        child: function(nodes)
        {
            var h = Selector.handlers;
            for (var i = 0, results = [], node; node = nodes[i]; i++)
            {
                for (var j = 0, child; child = node.childNodes[j]; j++)
                    if (child.nodeType == 1 && child.tagName != '!') results.push(child);
            }
            return results;
        },

        adjacent: function(nodes)
        {
            for (var i = 0, results = [], node; node = nodes[i]; i++)
            {
                var next = this.nextElementSibling(node);
                if (next) results.push(next);
            }
            return results;
        },

        laterSibling: function(nodes)
        {
            var h = Selector.handlers;
            for (var i = 0, results = [], node; node = nodes[i]; i++)
                h.concat(results, Element.nextSiblings(node));
            return results;
        },

        nextElementSibling: function(node)
        {
            while (node = node.nextSibling)
                if (node.nodeType == 1) return node;
            return null;
        },

        previousElementSibling: function(node)
        {
            while (node = node.previousSibling)
                if (node.nodeType == 1) return node;
            return null;
        },

        // TOKEN FUNCTIONS
        tagName: function(nodes, root, tagName, combinator)
        {
            var uTagName = tagName.toUpperCase();
            var results = [], h = Selector.handlers;
            if (nodes)
            {
                if (combinator)
                {
                    // fastlane for ordinary descendant combinators
                    if (combinator == "descendant")
                    {
                        for (var i = 0, node; node = nodes[i]; i++)
                            h.concat(results, node.getElementsByTagName(tagName));
                        return results;
                    } else nodes = this[combinator](nodes);
                    if (tagName == "*") return nodes;
                }
                for (var i = 0, node; node = nodes[i]; i++)
                    if (node.tagName.toUpperCase() === uTagName) results.push(node);
                return results;
            } else return root.getElementsByTagName(tagName);
        },

        id: function(nodes, root, id, combinator)
        {
            var targetNode = $(id), h = Selector.handlers;
            if (!targetNode)
            {
                var needsToSearch = root === document || root.sourceIndex < 1 ||
          !Element.descendantOf(root, document.documentElement);

                if (needsToSearch)
                {
                    var nodes = root.getElementsByTagName('*');
                    for (var i = 0, node; node = nodes[i]; i++)
                    {
                        if (node.id === id)
                        {
                            targetNode = node; break;
                        }
                    } if (!targetNode) return [];
                } else return [];
            }

            if (!nodes && root === document) return [targetNode];
            if (nodes)
            {
                if (combinator)
                {
                    if (combinator == 'child')
                    {
                        for (var i = 0, node; node = nodes[i]; i++)
                            if (targetNode.parentNode == node) return [targetNode];
                    } else if (combinator == 'descendant')
                    {
                        for (var i = 0, node; node = nodes[i]; i++)
                            if (Element.descendantOf(targetNode, node)) return [targetNode];
                    } else if (combinator == 'adjacent')
                    {
                        for (var i = 0, node; node = nodes[i]; i++)
                            if (Selector.handlers.previousElementSibling(targetNode) == node)
                            return [targetNode];
                    } else nodes = h[combinator](nodes);
                }
                for (var i = 0, node; node = nodes[i]; i++)
                    if (node == targetNode) return [targetNode];
                return [];
            }
            return (targetNode && Element.descendantOf(targetNode, root)) ? [targetNode] : [];
        },

        className: function(nodes, root, className, combinator)
        {
            if (nodes && combinator) nodes = this[combinator](nodes);
            return Selector.handlers.byClassName(nodes, root, className);
        },

        byClassName: function(nodes, root, className)
        {
            if (!nodes) nodes = Selector.handlers.descendant([root]);
            var needle = ' ' + className + ' ';
            for (var i = 0, results = [], node, nodeClassName; node = nodes[i]; i++)
            {
                nodeClassName = node.className;
                if (nodeClassName.length == 0) continue;
                if (nodeClassName == className || (' ' + nodeClassName + ' ').include(needle))
                    results.push(node);
            }
            return results;
        },

        attrPresence: function(nodes, root, attr, combinator)
        {
            if (!nodes) nodes = root.getElementsByTagName("*");
            if (nodes && combinator) nodes = this[combinator](nodes);
            var results = [];
            for (var i = 0, node; node = nodes[i]; i++)
                if (Element.hasAttribute(node, attr)) results.push(node);
            return results;
        },

        attr: function(nodes, root, attr, value, operator, combinator)
        {
            if (!nodes) nodes = root.getElementsByTagName("*");
            if (nodes && combinator) nodes = this[combinator](nodes);
            var handler = Selector.operators[operator], results = [];
            for (var i = 0, node; node = nodes[i]; i++)
            {
                var nodeValue = Element.readAttribute(node, attr);
                if (nodeValue === null) continue;
                if (handler(nodeValue, value)) results.push(node);
            }
            return results;
        },

        pseudo: function(nodes, name, value, root, combinator)
        {
            if (nodes && combinator) nodes = this[combinator](nodes);
            if (!nodes) nodes = root.getElementsByTagName("*");
            return Selector.pseudos[name](nodes, value, root);
        }
    },

    pseudos: {
        'first-child': function(nodes, value, root)
        {
            for (var i = 0, results = [], node; node = nodes[i]; i++)
            {
                if (Selector.handlers.previousElementSibling(node)) continue;
                results.push(node);
            }
            return results;
        },
        'last-child': function(nodes, value, root)
        {
            for (var i = 0, results = [], node; node = nodes[i]; i++)
            {
                if (Selector.handlers.nextElementSibling(node)) continue;
                results.push(node);
            }
            return results;
        },
        'only-child': function(nodes, value, root)
        {
            var h = Selector.handlers;
            for (var i = 0, results = [], node; node = nodes[i]; i++)
                if (!h.previousElementSibling(node) && !h.nextElementSibling(node))
                results.push(node);
            return results;
        },
        'nth-child': function(nodes, formula, root)
        {
            return Selector.pseudos.nth(nodes, formula, root);
        },
        'nth-last-child': function(nodes, formula, root)
        {
            return Selector.pseudos.nth(nodes, formula, root, true);
        },
        'nth-of-type': function(nodes, formula, root)
        {
            return Selector.pseudos.nth(nodes, formula, root, false, true);
        },
        'nth-last-of-type': function(nodes, formula, root)
        {
            return Selector.pseudos.nth(nodes, formula, root, true, true);
        },
        'first-of-type': function(nodes, formula, root)
        {
            return Selector.pseudos.nth(nodes, "1", root, false, true);
        },
        'last-of-type': function(nodes, formula, root)
        {
            return Selector.pseudos.nth(nodes, "1", root, true, true);
        },
        'only-of-type': function(nodes, formula, root)
        {
            var p = Selector.pseudos;
            return p['last-of-type'](p['first-of-type'](nodes, formula, root), formula, root);
        },

        // handles the an+b logic
        getIndices: function(a, b, total)
        {
            if (a == 0) return b > 0 ? [b] : [];
            return $R(1, total).inject([], function(memo, i)
            {
                if (0 == (i - b) % a && (i - b) / a >= 0) memo.push(i);
                return memo;
            });
        },

        // handles nth(-last)-child, nth(-last)-of-type, and (first|last)-of-type
        nth: function(nodes, formula, root, reverse, ofType)
        {
            if (nodes.length == 0) return [];
            if (formula == 'even') formula = '2n+0';
            if (formula == 'odd') formula = '2n+1';
            var h = Selector.handlers, results = [], indexed = [], m;
            h.mark(nodes);
            for (var i = 0, node; node = nodes[i]; i++)
            {
                if (!node.parentNode._countedByPrototype)
                {
                    h.index(node.parentNode, reverse, ofType);
                    indexed.push(node.parentNode);
                }
            }
            if (formula.match(/^\d+$/))
            { // just a number
                formula = Number(formula);
                for (var i = 0, node; node = nodes[i]; i++)
                    if (node.nodeIndex == formula) results.push(node);
            } else if (m = formula.match(/^(-?\d*)?n(([+-])(\d+))?/))
            { // an+b
                if (m[1] == "-") m[1] = -1;
                var a = m[1] ? Number(m[1]) : 1;
                var b = m[2] ? Number(m[2]) : 0;
                var indices = Selector.pseudos.getIndices(a, b, nodes.length);
                for (var i = 0, node, l = indices.length; node = nodes[i]; i++)
                {
                    for (var j = 0; j < l; j++)
                        if (node.nodeIndex == indices[j]) results.push(node);
                }
            }
            h.unmark(nodes);
            h.unmark(indexed);
            return results;
        },

        'empty': function(nodes, value, root)
        {
            for (var i = 0, results = [], node; node = nodes[i]; i++)
            {
                // IE treats comments as element nodes
                if (node.tagName == '!' || node.firstChild) continue;
                results.push(node);
            }
            return results;
        },

        'not': function(nodes, selector, root)
        {
            var h = Selector.handlers, selectorType, m;
            var exclusions = new Selector(selector).findElements(root);
            h.mark(exclusions);
            for (var i = 0, results = [], node; node = nodes[i]; i++)
                if (!node._countedByPrototype) results.push(node);
            h.unmark(exclusions);
            return results;
        },

        'enabled': function(nodes, value, root)
        {
            for (var i = 0, results = [], node; node = nodes[i]; i++)
                if (!node.disabled && (!node.type || node.type !== 'hidden'))
                results.push(node);
            return results;
        },

        'disabled': function(nodes, value, root)
        {
            for (var i = 0, results = [], node; node = nodes[i]; i++)
                if (node.disabled) results.push(node);
            return results;
        },

        'checked': function(nodes, value, root)
        {
            for (var i = 0, results = [], node; node = nodes[i]; i++)
                if (node.checked) results.push(node);
            return results;
        }
    },

    operators: {
        '=': function(nv, v) { return nv == v; },
        '!=': function(nv, v) { return nv != v; },
        '^=': function(nv, v) { return nv == v || nv && nv.startsWith(v); },
        '$=': function(nv, v) { return nv == v || nv && nv.endsWith(v); },
        '*=': function(nv, v) { return nv == v || nv && nv.include(v); },
        '~=': function(nv, v) { return (' ' + nv + ' ').include(' ' + v + ' '); },
        '|=': function(nv, v)
        {
            return ('-' + (nv || "").toUpperCase() +
     '-').include('-' + (v || "").toUpperCase() + '-');
        }
    },

    split: function(expression)
    {
        var expressions = [];
        expression.scan(/(([\w#:.~>+()\s-]+|\*|\[.*?\])+)\s*(,|$)/, function(m)
        {
            expressions.push(m[1].strip());
        });
        return expressions;
    },

    matchElements: function(elements, expression)
    {
        var matches = $$(expression), h = Selector.handlers;
        h.mark(matches);
        for (var i = 0, results = [], element; element = elements[i]; i++)
            if (element._countedByPrototype) results.push(element);
        h.unmark(matches);
        return results;
    },

    findElement: function(elements, expression, index)
    {
        if (Object.isNumber(expression))
        {
            index = expression; expression = false;
        }
        return Selector.matchElements(elements, expression || '*')[index || 0];
    },

    findChildElements: function(element, expressions)
    {
        expressions = Selector.split(expressions.join(','));
        var results = [], h = Selector.handlers;
        for (var i = 0, l = expressions.length, selector; i < l; i++)
        {
            selector = new Selector(expressions[i].strip());
            h.concat(results, selector.findElements(element));
        }
        return (l > 1) ? h.unique(results) : results;
    }
});

if (Prototype.Browser.IE)
{
    Object.extend(Selector.handlers, {
        // IE returns comment nodes on getElementsByTagName("*").
        // Filter them out.
        concat: function(a, b)
        {
            for (var i = 0, node; node = b[i]; i++)
                if (node.tagName !== "!") a.push(node);
            return a;
        },

        // IE improperly serializes _countedByPrototype in (inner|outer)HTML.
        unmark: function(nodes)
        {
            for (var i = 0, node; node = nodes[i]; i++)
                node.removeAttribute('_countedByPrototype');
            return nodes;
        }
    });
}

function $$()
{
    return Selector.findChildElements(document, $A(arguments));
}
var Form = {
    reset: function(form)
    {
        $(form).reset();
        return form;
    },

    serializeElements: function(elements, options)
    {
        if (typeof options !== 'object') options = { hash: !!options };
        else if (Object.isUndefined(options.hash)) options.hash = true;

        var key, value, type, isImageType, isSubmitButton, submitSerialized;
        var submit = options.submit;

        var data = elements.inject({}, function(result, element)
        {
            element = $(element);
            key = element.name;
            value = element.getValue();
            type = element.type;

            isImageType = type === 'image';
            isSubmitButton = type === 'submit' || isImageType;

            // Null values don't get serialized
            if (value === null) return result;
            // Disabled elements don't get serialized
            if (element.disabled) return result;
            // <input type="file|reset" /> doesn't get serialized
            if (type === 'file' || type === 'reset') return result;
            // Non-active submit buttons don't get serialized
            if (isSubmitButton &&
       (submit === false || submitSerialized ||
       (submit && !(key === submit || element === submit))))
                return result;

            if (isSubmitButton)
            {
                submitSerialized = true;
                if (isImageType)
                {
                    var prefix = key ? key + '.' : '',
           x = options.x || 0, y = options.y || 0;

                    result[prefix + 'x'] = x;
                    result[prefix + 'y'] = y;
                    return result;
                }
            } else if (!key) return result;

            if (key in result)
            {
                // a key is already present; construct an array of values
                if (!Object.isArray(result[key])) result[key] = [result[key]];
                result[key].push(value);
            } else result[key] = value;

            return result;
        });

        return options.hash ? data : Object.toQueryString(data);
    }
};

Form.Methods = {
    serialize: function(form, options)
    {
        return Form.serializeElements(Form.getElements(form), options);
    },

    getElements: function(form)
    {
        return $A($(form).getElementsByTagName('*')).inject([],
      function(elements, child)
      {
          if (Form.Element.Serializers[child.tagName.toLowerCase()])
              elements.push(Element.extend(child));
          return elements;
      }
    );
    },

    getInputs: function(form, typeName, name)
    {
        form = $(form);
        var inputs = form.getElementsByTagName('input');

        if (!typeName && !name) return $A(inputs).map(Element.extend);

        for (var i = 0, matchingInputs = [], length = inputs.length; i < length; i++)
        {
            var input = inputs[i];
            if ((typeName && input.type != typeName) || (name && input.name != name))
                continue;
            matchingInputs.push(Element.extend(input));
        }

        return matchingInputs;
    },

    disable: function(form)
    {
        form = $(form);
        Form.getElements(form).invoke('disable');
        return form;
    },

    enable: function(form)
    {
        form = $(form);
        Form.getElements(form).invoke('enable');
        return form;
    },

    findFirstElement: function(form)
    {
        var elements = $(form).getElements().findAll(function(element)
        {
            return 'hidden' != element.type && !element.disabled;
        });
        var firstByIndex = elements.findAll(function(element)
        {
            return element.hasAttribute('tabIndex') && element.tabIndex >= 0;
        }).sortBy(function(element) { return element.tabIndex }).first();

        return firstByIndex ? firstByIndex : elements.find(function(element)
        {
            return ['button', 'input', 'select', 'textarea'].include(element.tagName.toLowerCase());
        });
    },

    focusFirstElement: function(form)
    {
        form = $(form);
        form.findFirstElement().activate();
        return form;
    },

    request: function(form, options)
    {
        form = $(form), options = Object.clone(options || {});

        var params = options.parameters, action = form.readAttribute('action') || '';
        if (action.blank()) action = window.location.href;

        var submit = options.submit;
        delete options.submit;
        options.parameters = form.serialize({ submit: submit, hash: true });

        if (params)
        {
            if (Object.isString(params)) params = params.toQueryParams();
            Object.extend(options.parameters, params);
        }

        if (form.hasAttribute('method') && !options.method)
            options.method = form.method;

        return new Ajax.Request(action, options);
    }
};

/*--------------------------------------------------------------------------*/

Form.Element = {
    focus: function(element)
    {
        $(element).focus();
        return element;
    },

    select: function(element)
    {
        $(element).select();
        return element;
    }
};

Form.Element.Methods = {
    serialize: function(element)
    {
        element = $(element);
        if (!element.disabled && element.name)
        {
            var value = element.getValue();
            if (value != undefined)
            {
                var pair = {};
                pair[element.name] = value;
                return Object.toQueryString(pair);
            }
        }
        return '';
    },

    getValue: function(element)
    {
        if (!(element = $(element))) return null;
        var method = element.tagName.toLowerCase(), s = Form.Element.Serializers;
        return s[method] ? s[method](element) : null;
    },

    setValue: function(element, value)
    {
        if (!(element = $(element))) return null;
        var method = element.tagName.toLowerCase(), s = Form.Element.Serializers;
        if (s[method]) s[method](element, value);
        return element;
    },

    clear: function(element)
    {
        $(element).value = '';
        return element;
    },

    present: function(element)
    {
        return $(element).value != '';
    },

    activate: function(element)
    {
        element = $(element);
        try
        {
            element.focus();
            if (element.select && (element.tagName.toLowerCase() != 'input' ||
          !['button', 'image', 'reset', 'submit'].include(element.type)))
                element.select();
        } catch (e) { }
        return element;
    },

    disable: function(element)
    {
        element = $(element);
        element.disabled = true;
        return element;
    },

    enable: function(element)
    {
        element = $(element);
        element.disabled = false;
        return element;
    }
};

/*--------------------------------------------------------------------------*/

var Field = Form.Element;
var $F = Form.Element.Methods.getValue;

/*--------------------------------------------------------------------------*/

Form.Element.Serializers = {
    input: function(element, value)
    {
        switch (element.type.toLowerCase())
        {
            case 'checkbox':
            case 'radio':
                return Form.Element.Serializers.inputSelector(element, value);
            default:
                return Form.Element.Serializers.textarea(element, value);
        }
    },

    inputSelector: function(element, value)
    {
        if (Object.isUndefined(value)) return element.checked ? element.value : null;
        else element.checked = !!value;
    },

    button: function(element, value)
    {
        if (Object.isUndefined(value)) return element.innerHTML;
        else element.innerHTML = value;
    },

    textarea: function(element, value)
    {
        if (Object.isUndefined(value)) return element.value;
        else element.value = value;
    },

    select: function(element, value)
    {
        if (Object.isUndefined(value))
            return this[element.type == 'select-one' ?
        'selectOne' : 'selectMany'](element);
        else
        {
            var opt, currentValue, single = !Object.isArray(value);
            for (var i = 0, length = element.length; i < length; i++)
            {
                opt = element.options[i];
                currentValue = this.optionValue(opt);
                if (single)
                {
                    if (currentValue == value)
                    {
                        opt.selected = true;
                        return;
                    }
                }
                else opt.selected = value.include(currentValue);
            }
        }
    },

    selectOne: function(element)
    {
        var index = element.selectedIndex;
        return index >= 0 ? this.optionValue(element.options[index]) : null;
    },

    selectMany: function(element)
    {
        var values, length = element.length;
        if (!length) return null;

        for (var i = 0, values = []; i < length; i++)
        {
            var opt = element.options[i];
            if (opt.selected) values.push(this.optionValue(opt));
        }
        return values;
    },

    optionValue: function(opt)
    {
        // extend element because hasAttribute may not be native
        return Element.extend(opt).hasAttribute('value') ? opt.value : opt.text;
    }
};

/*--------------------------------------------------------------------------*/

Abstract.TimedObserver = Class.create(PeriodicalExecuter, {
    initialize: function($super, element, frequency, callback)
    {
        $super(callback, frequency);
        this.element = $(element);
        this.lastValue = this.getValue();
    },

    execute: function()
    {
        var value = this.getValue();
        if (Object.isString(this.lastValue) && Object.isString(value) ?
        this.lastValue != value : String(this.lastValue) != String(value))
        {
            this.callback(this.element, value);
            this.lastValue = value;
        }
    }
});

Form.Element.Observer = Class.create(Abstract.TimedObserver, {
    getValue: function()
    {
        return Form.Element.getValue(this.element);
    }
});

Form.Observer = Class.create(Abstract.TimedObserver, {
    getValue: function()
    {
        return Form.serialize(this.element);
    }
});

/*--------------------------------------------------------------------------*/

Abstract.EventObserver = Class.create({
    initialize: function(element, callback)
    {
        this.element = $(element);
        this.callback = callback;

        this.lastValue = this.getValue();
        if (this.element.tagName.toLowerCase() == 'form')
            this.registerFormCallbacks();
        else
            this.registerCallback(this.element);
    },

    onElementEvent: function()
    {
        var value = this.getValue();
        if (this.lastValue != value)
        {
            this.callback(this.element, value);
            this.lastValue = value;
        }
    },

    registerFormCallbacks: function()
    {
        Form.getElements(this.element).each(this.registerCallback, this);
    },

    registerCallback: function(element)
    {
        if (element.type)
        {
            switch (element.type.toLowerCase())
            {
                case 'checkbox':
                case 'radio':
                    Event.observe(element, 'click', this.onElementEvent.bind(this));
                    break;
                default:
                    Event.observe(element, 'change', this.onElementEvent.bind(this));
                    break;
            }
        }
    }
});

Form.Element.EventObserver = Class.create(Abstract.EventObserver, {
    getValue: function()
    {
        return Form.Element.getValue(this.element);
    }
});

Form.EventObserver = Class.create(Abstract.EventObserver, {
    getValue: function()
    {
        return Form.serialize(this.element);
    }
});
if (!window.Event) var Event = {};

Object.extend(Event, {
    KEY_BACKSPACE: 8,
    KEY_TAB: 9,
    KEY_RETURN: 13,
    KEY_ESC: 27,
    KEY_LEFT: 37,
    KEY_UP: 38,
    KEY_RIGHT: 39,
    KEY_DOWN: 40,
    KEY_DELETE: 46,
    KEY_HOME: 36,
    KEY_END: 35,
    KEY_PAGEUP: 33,
    KEY_PAGEDOWN: 34,
    KEY_INSERT: 45,

    cache: {},

    relatedTarget: function(event)
    {
        var element;
        switch (event.type)
        {
            case 'mouseover': element = event.fromElement; break;
            case 'mouseout': element = event.toElement; break;
            default: return null;
        }
        return Element.extend(element);
    }
});

Event.Methods = (function()
{
    var isButton;

    if (Prototype.Browser.IE)
    {
        var buttonMap = { 0: 1, 1: 4, 2: 2 };
        isButton = function(event, code)
        {
            return event.button == buttonMap[code];
        };

    } else if (Prototype.Browser.WebKit)
    {
        isButton = function(event, code)
        {
            switch (code)
            {
                case 0: return event.which == 1 && !event.metaKey;
                case 1: return event.which == 1 && event.metaKey;
                default: return false;
            }
        };

    } else
    {
        isButton = function(event, code)
        {
            return event.which ? (event.which === code + 1) : (event.button === code);
        };
    }

    return {
        isLeftClick: function(event) { return isButton(event, 0) },
        isMiddleClick: function(event) { return isButton(event, 1) },
        isRightClick: function(event) { return isButton(event, 2) },

        element: function(event)
        {
            event = Event.extend(event);
            var node = event.target, currentTarget = event.currentTarget, type = event.type;

            if (currentTarget && currentTarget.tagName)
            {
                // Firefox screws up the "click" event when moving between radio buttons
                // via arrow keys. It also screws up the "load" and "error" events on images,
                // reporting the document as the target instead of the original image.
                if (['load', 'error'].include(type) ||
         (currentTarget.tagName.toUpperCase() === "INPUT" && currentTarget.type === "radio" && type === "click"))
                    node = currentTarget;
            }

            return Element.extend(node && node.nodeType == Node.TEXT_NODE ?
       node.parentNode : node);
        },

        findElement: function(event, expression)
        {
            var element = Event.element(event);
            if (!expression) return element;
            var elements = [element].concat(element.ancestors());
            return Selector.findElement(elements, expression, 0);
        },

        pointer: function(event)
        {
            var docElement = document.documentElement,
      body = document.body || { scrollLeft: 0, scrollTop: 0 };
            return {
                x: event.pageX || (event.clientX +
          (docElement.scrollLeft || body.scrollLeft) -
          (docElement.clientLeft || 0)),
                y: event.pageY || (event.clientY +
          (docElement.scrollTop || body.scrollTop) -
          (docElement.clientTop || 0))
            };
        },

        pointerX: function(event) { return Event.pointer(event).x },
        pointerY: function(event) { return Event.pointer(event).y },

        stop: function(event)
        {
            Event.extend(event);
            event.preventDefault();
            event.stopPropagation();
            event.stopped = true;
        }
    };
})();

Event.extend = (function()
{
    var methods = Object.keys(Event.Methods).inject({}, function(m, name)
    {
        m[name] = Event.Methods[name].methodize();
        return m;
    });

    if (Prototype.Browser.IE)
    {
        Object.extend(methods, {
            stopPropagation: function() { this.cancelBubble = true },
            preventDefault: function() { this.returnValue = false },
            inspect: function() { return "[object Event]" }
        });

        return function(event)
        {
            if (!event) return false;
            if (event._extendedByPrototype) return event;

            var pointer = Event.pointer(event);
            Object.extend(event, {
                _extendedByPrototype: Prototype.emptyFunction,
                target: Element.extend(event.srcElement),
                relatedTarget: Event.relatedTarget(event),
                pageX: pointer.x,
                pageY: pointer.y
            });
            return Object.extend(event, methods);
        };

    } else
    {
        Event.prototype = Event.prototype || document.createEvent("HTMLEvents")['__proto__'];
        Object.extend(Event.prototype, methods);
        return Prototype.K;
    }
})();

Object.extend(Event, (function()
{
    var cache = Event.cache;

    function getEventID(element)
    {
        // Event ID is stored as the 0th index in a one-item array so that it
        // won't get copied to a new node when cloneNode is called.
        if (element === window) return 1;
        if (element._prototypeEventID) return element._prototypeEventID[0];
        return (element._prototypeEventID = [arguments.callee.id++])[0];
    }
    getEventID.id = 2;

    function getDOMEventName(eventName)
    {
        if (eventName && eventName.include(':')) return "dataavailable";
        return eventName;
    }

    function createWrapperFunction(element, eventName, handler)
    {
        return function(event)
        {
            if (!Event || !Event.extend ||
       (event.eventName && event.eventName != eventName))
                return false;

            handler.call(element, Event.extend(event));
        };
    }

    if (!Prototype.Browser.IE)
    {
        var events = { enter: 'over', leave: 'out' },
     isEnterLeave = /^mouse(enter|leave)$/;

        getDOMEventName = getDOMEventName.wrap(function(proceed, eventName)
        {
            var EL = isEnterLeave.exec(eventName);
            if (EL) eventName = 'mouse' + events[EL[1]];
            return proceed(eventName);
        });

        createWrapperFunction = createWrapperFunction.wrap(function(proceed, element, eventName, handler)
        {
            var wrapper = proceed(element, eventName, handler);
            if (isEnterLeave.test(eventName))
            {
                wrapper = wrapper.wrap(function(proceed, event)
                {
                    var parent = event.relatedTarget;
                    while (parent && parent != element)
                    {
                        try { parent = parent.parentNode; }
                        catch (e) { parent = element; }
                    }
                    if (parent == element) return;
                    proceed(event);
                });
            }
            return wrapper;
        });
    }

    function getCacheForID(id)
    {
        return cache[id] = cache[id] || {};
    }

    function getWrappersForEventName(id, eventName)
    {
        var c = getCacheForID(id);
        return c[eventName] = c[eventName] || [];
    }

    function createWrapper(element, eventName, handler)
    {
        var id = getEventID(element), c = getCacheForID(id);

        // Attach the element itself onto its cache entry so we can retrieve it for
        // cleanup on page unload.
        if (!c.element) c.element = element;

        var w = getWrappersForEventName(id, eventName);
        if (w.pluck("handler").include(handler)) return false;

        var wrapper = createWrapperFunction(element, eventName, handler);

        wrapper.handler = handler;
        w.push(wrapper);
        return wrapper;
    }

    function findWrapper(id, eventName, handler)
    {
        var w = getWrappersForEventName(id, eventName);
        return w.find(function(wrapper) { return wrapper.handler == handler });
    }

    function destroyWrapper(id, eventName, handler)
    {
        var c = getCacheForID(id);
        if (!c[eventName]) return false;
        c[eventName] = c[eventName].without(findWrapper(id, eventName, handler));
    }

    // Loop through all elements and remove all handlers on page unload. IE
    // needs this in order to prevent memory leaks.
    function purgeListeners()
    {
        var element, entry;
        for (var i in Event.cache)
        {
            entry = Event.cache[i];
            Event.stopObserving(entry.element);
            entry.element = null;
        }
    }

    function onStop()
    {
        document.detachEvent("onstop", onStop);
        purgeListeners();
    }

    function onBeforeUnload()
    {
        if (document.readyState === "interactive")
        {
            document.attachEvent("onstop", onStop);
            (function() { document.detachEvent("onstop", onStop); }).defer();
        }
    }

    if (window.attachEvent && !window.addEventListener)
    {
        // Internet Explorer needs to remove event handlers on page unload
        // in order to avoid memory leaks.
        window.attachEvent("onunload", purgeListeners);

        // IE also doesn't fire the unload event if the page is navigated away
        // from before it's done loading. Workaround adapted from
        // http://blog.moxiecode.com/2008/04/08/unload-event-never-fires-in-ie/.
        window.attachEvent("onbeforeunload", onBeforeUnload);
    }

    // Safari has a dummy event handler on page unload so that it won't
    // use its bfcache. Safari <= 3.1 has an issue with restoring the "document"
    // object when page is returned to via the back button using its bfcache.
    else if (Prototype.Browser.WebKit)
    {
        window.addEventListener("unload", Prototype.emptyFunction, false);
    }

    return {
        observe: function(element, eventName, handler)
        {
            element = $(element);
            var name = getDOMEventName(eventName);

            var wrapper = createWrapper(element, eventName, handler);
            if (!wrapper) return element;

            if (element.addEventListener)
            {
                element.addEventListener(name, wrapper, false);
            } else
            {
                element.attachEvent("on" + name, wrapper);
            }

            return element;
        },

        stopObserving: function(element, eventName, handler)
        {
            element = $(element);
            eventName = Object.isString(eventName) ? eventName : null;
            var id = getEventID(element), c = cache[id];

            if (!c)
            {
                return element;
            }
            else if (!handler && eventName)
            {
                getWrappersForEventName(id, eventName).each(function(wrapper)
                {
                    Event.stopObserving(element, eventName, wrapper.handler);
                });
                return element;
            }
            else if (!eventName)
            {
                Object.keys(c).without("element").each(function(eventName)
                {
                    Event.stopObserving(element, eventName);
                });
                return element;
            }

            var wrapper = findWrapper(id, eventName, handler);
            if (!wrapper) return element;

            var name = getDOMEventName(eventName);
            if (element.removeEventListener)
            {
                element.removeEventListener(name, wrapper, false);
            } else
            {
                element.detachEvent("on" + name, wrapper);
            }
            destroyWrapper(id, eventName, handler);

            return element;
        },

        fire: function(element, eventName, memo)
        {
            element = $(element);
            if (element == document && document.createEvent && !element.dispatchEvent)
                element = document.documentElement;

            var event;
            if (document.createEvent)
            {
                event = document.createEvent("HTMLEvents");
                event.initEvent("dataavailable", true, true);
            } else
            {
                event = document.createEventObject();
                event.eventType = "ondataavailable";
            }

            event.eventName = eventName;
            event.memo = memo || {};

            if (document.createEvent)
            {
                element.dispatchEvent(event);
            } else
            {
                element.fireEvent(event.eventType, event);
            }

            return Event.extend(event);
        }
    };
})());

Object.extend(Event, Event.Methods);

Element.addMethods({
    fire: Event.fire,
    observe: Event.observe,
    stopObserving: Event.stopObserving
});

Object.extend(document, {
    fire: Element.Methods.fire.methodize(),
    observe: Element.Methods.observe.methodize(),
    stopObserving: Element.Methods.stopObserving.methodize(),
    loaded: false
});

(function()
{
    /* Support for the DOMContentLoaded event is based on work by Dan Webb,
    Matthias Miller, Dean Edwards, John Resig and Diego Perini. */

    var timer;

    function fireContentLoadedEvent()
    {
        if (document.loaded) return;
        if (timer) window.clearInterval(timer);
        document.loaded = true;
        document.fire("dom:loaded");
    }

    function isCssLoaded()
    {
        return true;
    }

    if (document.addEventListener)
    {
        if (Prototype.Browser.Opera)
        {
            isCssLoaded = function()
            {
                var sheets = document.styleSheets, length = sheets.length;
                while (length--) if (sheets[length].disabled) return false;
                return true;
            };
            // Force check to end when window loads
            Event.observe(window, "load", function() { isCssLoaded = function() { return true } });
        }
        else if (Prototype.Browser.WebKit)
        {
            isCssLoaded = function()
            {
                var length = document.getElementsByTagName('style').length,
        links = document.getElementsByTagName('link');
                for (var i = 0, link; link = links[i]; i++)
                    if (link.getAttribute('rel') == "stylesheet") length++;
                return document.styleSheets.length >= length;
            };
        }
        document.addEventListener("DOMContentLoaded", function()
        {
            // Ensure all stylesheets are loaded, solves Opera/Safari issue
            if (!isCssLoaded()) return arguments.callee.defer();
            fireContentLoadedEvent();
        }, false);

    } else
    {
        document.attachEvent("onreadystatechange", function()
        {
            if (document.readyState == "complete")
            {
                document.detachEvent("onreadystatechange", arguments.callee);
                fireContentLoadedEvent();
            }
        });

        if (window == top)
        {
            timer = setInterval(function()
            {
                try
                {
                    document.documentElement.doScroll("left");
                } catch (e) { return }
                fireContentLoadedEvent();
            }, 10);
        }
    }

    // Safari <3.1 doesn't support DOMContentLoaded
    if (Prototype.Browser.WebKit && (navigator.userAgent.match(/AppleWebKit\/(\d+)/)[1] < 525))
    {
        timer = setInterval(function()
        {
            if (/loaded|complete/.test(document.readyState) && isCssLoaded())
                fireContentLoadedEvent();
        }, 10);
    }

    // Worst case fallback...
    Event.observe(window, "load", fireContentLoadedEvent);
})();
/*------------------------------- DEPRECATED -------------------------------*/

Hash.toQueryString = Object.toQueryString;

var Toggle = { display: Element.toggle };

Element.Methods.childOf = Element.Methods.descendantOf;

var Insertion = {
    Before: function(element, content)
    {
        return Element.insert(element, { before: content });
    },

    Top: function(element, content)
    {
        return Element.insert(element, { top: content });
    },

    Bottom: function(element, content)
    {
        return Element.insert(element, { bottom: content });
    },

    After: function(element, content)
    {
        return Element.insert(element, { after: content });
    }
};

var $continue = new Error('"throw $continue" is deprecated, use "return" instead');

// This should be moved to script.aculo.us; notice the deprecated methods
// further below, that map to the newer Element methods.
var Position = {
    // set to true if needed, warning: firefox performance problems
    // NOT neeeded for page scrolling, only if draggable contained in
    // scrollable elements
    includeScrollOffsets: false,

    // must be called before calling withinIncludingScrolloffset, every time the
    // page is scrolled
    prepare: function()
    {
        this.deltaX = window.pageXOffset
                || document.documentElement.scrollLeft
                || document.body.scrollLeft
                || 0;
        this.deltaY = window.pageYOffset
                || document.documentElement.scrollTop
                || document.body.scrollTop
                || 0;
    },

    // caches x/y coordinate pair to use with overlap
    within: function(element, x, y)
    {
        if (this.includeScrollOffsets)
            return this.withinIncludingScrolloffsets(element, x, y);

        var dimensions = Element.getDimensions(element);
        this.xcomp = x;
        this.ycomp = y;
        this.offset = Element.cumulativeOffset(element);

        return (y >= this.offset[1] &&
            y < this.offset[1] + dimensions.height &&
            x >= this.offset[0] &&
            x < this.offset[0] + dimensions.width);
    },

    withinIncludingScrolloffsets: function(element, x, y)
    {
        var offsetcache = Element.cumulativeScrollOffset(element),
    dimensions = Element.getDimensions(element);

        this.xcomp = x + offsetcache[0] - this.deltaX;
        this.ycomp = y + offsetcache[1] - this.deltaY;
        this.offset = Element.cumulativeOffset(element);

        return (this.ycomp >= this.offset[1] &&
            this.ycomp < this.offset[1] + dimensions.height &&
            this.xcomp >= this.offset[0] &&
            this.xcomp < this.offset[0] + dimensions.width);
    },

    // within must be called directly before
    overlap: function(mode, element)
    {
        var dimensions = Element.getDimensions(element);
        if (!mode) return 0;
        if (mode == 'vertical')
            return ((this.offset[1] + dimensions.height) - this.ycomp) /
        dimensions.height;
        if (mode == 'horizontal')
            return ((this.offset[0] + dimensions.width) - this.xcomp) /
        dimensions.width;
    },

    // Deprecation layer -- use newer Element methods now (1.5.2).

    cumulativeOffset: Element.Methods.cumulativeOffset,

    positionedOffset: Element.Methods.positionedOffset,

    absolutize: function(element)
    {
        Position.prepare();
        return Element.absolutize(element);
    },

    relativize: function(element)
    {
        Position.prepare();
        return Element.relativize(element);
    },

    realOffset: Element.Methods.cumulativeScrollOffset,

    offsetParent: Element.Methods.getOffsetParent,

    page: Element.Methods.viewportOffset,

    clone: function(source, target, options)
    {
        options = options || {};
        return Element.clonePosition(target, source, options);
    }
};

/*--------------------------------------------------------------------------*/

if (!document.getElementsByClassName) document.getElementsByClassName = function(instanceMethods)
{
    function iter(name)
    {
        return name.blank() ? null : "[contains(concat(' ', @class, ' '), ' " + name + " ')]";
    }

    instanceMethods.getElementsByClassName = Prototype.BrowserFeatures.XPath ?
  function(element, className)
  {
      className = className.toString().strip();
      var cond = /\s/.test(className) ? $w(className).map(iter).join('') : iter(className);
      return cond ? document._getElementsByXPath('.//*' + cond, element) : [];
  } : function(element, className)
  {
      className = className.toString().strip();
      var elements = [], classNames = (/\s/.test(className) ? $w(className) : null);
      if (!classNames && !className) return elements;

      var nodes = $(element).getElementsByTagName('*');
      className = ' ' + className + ' ';

      for (var i = 0, child, cn; child = nodes[i]; i++)
      {
          if (child.className && (cn = ' ' + child.className + ' ') && (cn.include(className) ||
          (classNames && classNames.all(function(name)
          {
              return !name.toString().blank() && cn.include(' ' + name + ' ');
          }))))
              elements.push(Element.extend(child));
      }
      return elements;
  };

    return function(className, parentElement)
    {
        return $(parentElement || document.body).getElementsByClassName(className);
    };
} (Element.Methods);

/*--------------------------------------------------------------------------*/

Element.ClassNames = Class.create();
Element.ClassNames.prototype = {
    initialize: function(element)
    {
        this.element = $(element);
    },

    _each: function(iterator)
    {
        this.element.className.split(/\s+/).select(function(name)
        {
            return name.length > 0;
        })._each(iterator);
    },

    set: function(className)
    {
        this.element.className = className;
    },

    add: function(classNameToAdd)
    {
        if (this.include(classNameToAdd)) return;
        this.set($A(this).concat(classNameToAdd).join(' '));
    },

    remove: function(classNameToRemove)
    {
        if (!this.include(classNameToRemove)) return;
        this.set($A(this).without(classNameToRemove).join(' '));
    },

    toString: function()
    {
        return $A(this).join(' ');
    }
};

Object.extend(Element.ClassNames.prototype, Enumerable);

/*--------------------------------------------------------------------------*/

Element.addMethods();