var Prototype =
    {
    Version: "00.00.01",
    Browser: 
        {
        IE: !!(window.attachEvent && !window.opera),
        Opera: !!window.opera,
        WebKit: navigator.userAgent.indexOf("AppleWebKit/") > -1,
        Gecko: navigator.userAgent.indexOf("Gecko") > -1 && navigator.userAgent.indexOf("KHTML") == -1
        },
    BrowserFeatures:
        {
        XPath: !!document.evaluate,
        ElementExtensions: !!window.HTMLElement,
        SpecificElementExtensions: (document.createElement("div").__proto__ != document.createElement("form").__proto__)
        },
    ScriptFragment: "<script[^>]*>([\\S\\s]*?)<\/script>",
    JSONFilter: /^\/\*-secure-([\s\S]*)\*\/\s*$/,
    EmptyFunction: function() {},
    K: function(x) 
        { 
        return x; 
        }
    }
    
var Class =
    {
    Create: function()
        {
        return function()
            {
            this.Initialize.apply(this, arguments);
            }
        }
    }
    
var Abstract = new Object();
Object.Extend = function(destination, source)
    {
    for (var property in source)
        {
        destination[property] = source[property];
        }
    return destination;
    }
    
Object.Extend(Number.prototype,
    {
    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";
        }
    });
    
Date.prototype.ToJSON = function()
    {
    return "\"" + this.getFullYear() + "-" + (this.getMonth() + 1).toPaddedString(2) + "-" + this.getDate().toPaddedString() + "T" + this.getHours().toPaddedString(2) + ":" + this.getMinutes().toPaddedString(2) + ":" + this.getSeconds().toPaddedString(2) + "\"";
    };
        
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 (ex)
                {
                }
            }
        return returnValue;
        }
    }
    
Object.Extend(String.prototype,
    {
    Times: function(count) 
        {
        var result = '';
        for (var i = 0; i < count; i++) 
            {
            result += this;
            }
        return result;
        }
    });

/*
Object.extend(Object,
    {
    inspect: function(object)
        {
        try
            {
            if (object === undefined)
                {
                return "undefined";
                }
            if (object === null)
                {
                return "null";
                }
            return object.inspect ? object.inspect() : object.toString();
            }
        catch(ex)
            {
            if (ex instanceof RangeError)
                {
                return "...";
                }
            throw ex;
            }
        },
    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.ownerDocument === document)
            {
            return;
            }
        var results = [];
        for (var property in object)
            {
            var value = Object.toJSON(object[property]);
            if (value !== undefined)
                {
                results.push(property.toJSON() + ":" + value);
                }
            }
        return "{" + results.join(", ") + "}";
        },
    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);
        }
    });
    
Function.prototype.bind = function()
    {
    var __method = this;
    var args = $A(arguments);
    var object = args.shift();
    return function()
        {
        __method.apply(object, args.concat($A(arguments)));
        }
    }
    
Function.prototype.bindAsEventListener = function(object)
    {
    var __method = this;
    var args = $A(arguments);
    object = args.shift();
    return function(event)
        {
        __method.apply(object, [event || window.event].concat(args));
        }
    }
    
Object.extend(Number.prototype,
    {
    toColorPart: function()
        {
        return this.toPaddedString(2, 16);
        },
    succ: function()
        {
        return this + 1;
        },
    times: function(iterator)
        {
        $R(0, this, true).each(iterator);
        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";
        }
    });
    
Date.prototype.toJSON = function()
    {
    return "\"" + this.getFullYear() + "-" + (this.getMonth() + 1).toPaddedString(2) + "-" + this.getDate().toPaddedString() + "T" + this.getHours().toPaddedString(2) + ":" + this.getMinutes().toPaddedString(2) + ":" + this.getSeconds().toPaddedString(2) + "\"";
    };
        
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 (ex)
                {
                }
            }
        return returnValue;
        }
    }

var PeriodicalExecuter = Class.create();
PeriodicalExecuter.prototype = 
    {
    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);
        },
    stop: function() 
        {
        if (!this.timer) 
            {
            return;
            }
        clearInterval(this.timer);
        this.timer = null;
        },
    onTimerEvent: function() 
        {
        if (!this.currentlyExecuting) 
            {
            try 
                {
                this.currentlyExecuting = true;
                this.callback(this);
                } 
            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 = "";
        var source = this;
        var match;
        replacement = arguments.callee.prepareReplacement(replacement);
        
        while (source.length)
            {
            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 = count === undefined ? 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 this;
        },
    truncate: function(length, truncation)
        {
        length = length || 30;
        truncation = truncation === undefined ? "..." : truncation;
        return this.length > length ? this.slice(0, length - truncation.length) + truncation : 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, 'img');
        var matchOne = new RegExp(Prototype.ScriptFragment, 'im');
        return (this.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.div.innerHTML;
        },
    unescapeHTML: function() 
        {
        var div = document.createElement('div');
        div.innerHTML = this.stripTags();
        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 (hash[key].constructor != Array) 
                        {
                        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) 
        {
        var result = '';
        for (var i = 0; i < count; i++) 
            {
            result += this;
            }
        return result;
        },
    camelize: function() 
        {
        var parts = this.split('-');
        var 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.replace(/\\./g, '@').replace(/"[^"\\\n\r]*"/g, '');
        return (/^[,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]*$/).test(str);
        },
    evalJSON: function(sanitize) 
        {
        var json = this.unfilterJSON();
        try 
            {
            if (!sanitize || json.isJSON()) 
                {
                return eval('(' + json + ')');
                }
            } 
        catch (ex) 
            { 
            }
        throw new SyntaxError('Badly formed JSON string: ' + this.inspect());
        },
    include: function(pattern) 
        {
        return this.indexOf(pattern) > -1;
        },
    startsWith: function(pattern) 
        {
        return this.indexOf(pattern) === 0;
        },
    endsWith: function(pattern) 
        {
        var d = this.length - pattern.length;
        return d >= 0 && this.lastIndexOf(pattern) === d;
        },
    empty: function() 
        {
        return this == '';
        },
    blank: function() 
        {
        return /^\s*$/.test(this);
        }
    });
    
if (Prototype.Browser.WebKit || Prototype.Browser.IE)
    {
    Object.extend(String.prototype, 
        {
        escapeHTML: function() 
            {
            return this.replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;');
            },
        unescapeHTML: function() 
            {
            return this.replace(/&amp;/g,'&').replace(/&lt;/g,'<').replace(/&gt;/g,'>');
            }
        });
    }

String.prototype.gsub.prepareReplacement = function(replacement) 
    {
    if (typeof(replacement) == 'function') 
        {
        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, 
    {
    div: document.createElement('div'),
    text: document.createTextNode('')
    });

with (String.prototype.escapeHTML) 
    {
    div.appendChild(text);
    }
    
var Template = Class.create();
Template.Pattern = /(^|.|\r|\n)(#\{(.*?)\})/;
Template.prototype = 
    {
    initialize: function(template, pattern) 
        {
        this.template = template.toString();
        this.pattern  = pattern || Template.Pattern;
        },
    evaluate: function(object) 
        {
        return this.template.gsub(this.pattern, function(match) 
            {
            var before = match[1];
            if (before == '\\') 
                {
                return match[2];
                }
            return before + String.interpret(object[match[3]]);
            });
        }
    }

var $break = {};
var $continue = new Error("throw \"$continue\" is deprecated, use \"return\" instead");

var Enumerable = 
    {
    each: function(iterator) 
        {
        var index = 0;
        try 
            {
            this._each(function(value) 
                {
                iterator(value, index++);
                });
            } 
        catch (ex) 
            {
            if (ex != $break) 
                {
                throw ex;
                }
            }
        return this;
        },
    eachSlice: function(number, iterator) 
        {
        var index = -number;
        var slices = [];
        var array = this.toArray();
        while ((index += number) < array.length)
            {
            slices.push(array.slice(index, index+number));
            }
        return slices.map(iterator);
        },
    all: function(iterator) 
        {
        var result = true;
        this.each(function(value, index) 
            {
            result = result && !!(iterator || Prototype.K)(value, index);
            if (!result) 
                {
                throw $break;
                }
            });
        return result;
        },
    any: function(iterator) 
        {
        var result = false;
        this.each(function(value, index) 
            {
            if (result = !!(iterator || Prototype.K)(value, index))
                {
                throw $break;
                }
            });
        return result;
        },
    collect: function(iterator) 
        {
        var results = [];
        this.each(function(value, index) 
            {
            results.push((iterator || Prototype.K)(value, index));
            });
        return results;
        },
    detect: function(iterator) 
        {
        var result;
        this.each(function(value, index) 
            {
            if (iterator(value, index)) 
                {
                result = value;
                throw $break;
                }
            });
        return result;
        },
    findAll: function(iterator) 
        {
        var results = [];
        this.each(function(value, index) 
            {
            if (iterator(value, index))
                {
                results.push(value);
                }
            });
        return results;
        },
    grep: function(pattern, iterator) 
        {
        var results = [];
        this.each(function(value, index) 
            {
            var stringValue = value.toString();
            if (stringValue.match(pattern))
                {
                results.push((iterator || Prototype.K)(value, index));
                }
            });
        return results;
        },
    include: function(object) 
        {
        var found = false;
        this.each(function(value) 
            {
            if (value == object) 
                {
                found = true;
                throw $break;
                }
            });
        return found;
        },
    inGroupsOf: function(number, fillWith) 
        {
        fillWith = fillWith === undefined ? null : fillWith;
        return this.eachSlice(number, function(slice) 
            {
            while(slice.length < number) 
                {
                slice.push(fillWith);
                }
            return slice;
            });
        },
    inject: function(memo, iterator) 
        {
        this.each(function(value, index) 
            {
            memo = iterator(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) 
        {
        var result;
        this.each(function(value, index) 
            {
            value = (iterator || Prototype.K)(value, index);
            if (result == undefined || value >= result)
                {
                result = value;
                }
            });
        return result;
        },
    min: function(iterator) 
        {
        var result;
        this.each(function(value, index) 
            {
            value = (iterator || Prototype.K)(value, index);
            if (result == undefined || value < result)
                {
                result = value;
                }
            });
        return result;
        },
    partition: function(iterator) 
        {
        var trues = [];
        var falses = [];
        this.each(function(value, index) 
            {
            ((iterator || Prototype.K)(value, index) ? trues : falses).push(value);
            });
        return [trues, falses];
        },
    pluck: function(property) 
        {
        var results = [];
        this.each(function(value, index) 
            {
            results.push(value[property]);
            });
        return results;
        },
    reject: function(iterator) 
        {
        var results = [];
        this.each(function(value, index) 
            {
            if (!iterator(value, index))
                {
                results.push(value);
                }
            });
        return results;
        },
    sortBy: function(iterator) 
        {
        return this.map(function(value, index) 
            {
            return {value: value, criteria: iterator(value, index)};
            }).sort(function(left, right) 
                {
                var a = left.criteria;
                var b = right.criteria;
                return a < b ? -1 : a > b ? 1 : 0;
                }).pluck('value');
        },
    toArray: function() 
        {
        return this.map();
        },
    zip: function() 
        {
        var iterator = Prototype.K;
        var args = $A(arguments);
        if (typeof(args.last()) == 'function')
            {
            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,
    member: Enumerable.include,
    entries: Enumerable.toArray
    });
    
var $A = Array.from = function(iterable) 
    {
    if (!iterable)
        {
        return [];
        }
    if (iterable.toArray) 
        {
        return iterable.toArray();
        } 
    else 
        {
        var results = [];
        for (var i = 0, length = iterable.length; i < length; i++)
            {
            results.push(iterable[i]);
            }
        return results;
        }
    }

if (Prototype.Browser.WebKit) 
    {
    $A = Array.from = function(iterable) 
        {
        if (!iterable) 
            {
            return [];
            }
        if (!(typeof(iterable) == 'function' && iterable == '[object NodeList]') && iterable.toArray) 
            {
            return iterable.toArray();
            } 
        else 
            {      
            var results = [];
            for (var i = 0, length = iterable.length; i < length; i++)
                {
                results.push(iterable[i]);
                }
            return results;
            }
        }
    }

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(value && value.constructor == Array ? value.flatten() : [value]);
            });
        },
    without: function() 
        {
        var values = $A(arguments);
        return this.select(function(value) 
            {
            return !values.include(value);
            });
        },
    indexOf: function(object) 
        {
        for (var i = 0, length = this.length; i < length; i++)
            {
            if (this[i] == object) 
                {
                return i;
                }
            }
        return -1;
        },
    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;
            });
        },
    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 (value !== undefined) 
                {
                results.push(value);
                }
            });
        return '[' + results.join(', ') + ']';
        }
    });
    
Array.prototype.toArray = Array.prototype.clone;

function $w(string) 
    {
    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 (arguments[i].constructor == Array) 
                {
                for (var j = 0, arrayLength = arguments[i].length; j < arrayLength; j++)
                    {
                    array.push(arguments[i][j]);
                    }
                } 
            else 
                {
                array.push(arguments[i]);
                }
            }
        return array;
        }
    }
    
var Hash = function(object) 
    {
    if (object instanceof Hash) 
        {
        this.merge(object);
        }
    else 
        {
        Object.extend(this, object || {});
        }
    };

Object.extend(Hash, 
    {
    toQueryString: function(obj) 
        {
        var parts = [];
        parts.add = arguments.callee.addPair;

        this.prototype._each.call(obj, function(pair) 
            {
            if (!pair.key) 
                {
                return;
                }
            var value = pair.value;
            
            if (value && typeof(value) == 'object') 
                {
                if (value.constructor == Array) 
                    {
                    value.each(function(value) 
                        {
                        parts.add(pair.key, value);
                        });
                    }
                return;
                }
            parts.add(pair.key, value);
            });
        return parts.join('&');
        },
    toJSON: function(object) 
        {
        var results = [];
        this.prototype._each.call(object, function(pair) 
            {
            var value = Object.toJSON(pair.value);
            if (value !== undefined) 
                {
                results.push(pair.key.toJSON() + ': ' + value);
                }
            });
        return '{' + results.join(', ') + '}';
        }
    });

Hash.toQueryString.addPair = function(key, value, prefix) 
    {
    key = encodeURIComponent(key);
    if (value === undefined) 
        {
        this.push(key);
        }
    else 
        {
        this.push(key + '=' + (value == null ? '' : encodeURIComponent(value)));
        }
    }

Object.extend(Hash.prototype, Enumerable);
Object.extend(Hash.prototype, 
    {
    _each: function(iterator) 
        {
        for (var key in this) 
            {
            var value = this[key];
            if (value && value == Hash.prototype[key]) 
                {
                continue;
                }
                
            var pair = [key, value];
            pair.key = key;
            pair.value = value;
            iterator(pair);
            }
        },
    keys: function() 
        {
        return this.pluck('key');
        },
    values: function() 
        {
        return this.pluck('value');
        },
    merge: function(hash) 
        {
        return $H(hash).inject(this, function(mergedHash, pair) 
            {
            mergedHash[pair.key] = pair.value;
            return mergedHash;
            });
        },
    remove: function() 
        {
        var result;
        for(var i = 0, length = arguments.length; i < length; i++) 
            {
            var value = this[arguments[i]];
            if (value !== undefined)
                {
                if (result === undefined) 
                    {
                    result = value;
                    }
                else 
                    {
                    if (result.constructor != Array) 
                        {
                        result = [result];
                        }
                    result.push(value)
                    }
                }
            delete this[arguments[i]];
            }
        return result;
        },
    toQueryString: function() 
        {
        return Hash.toQueryString(this);
        },
    inspect: function() 
        {
        return '#<Hash:{' + this.map(function(pair) 
            {
            return pair.map(Object.inspect).join(': ');
            }).join(', ') + '}>';
        },
    toJSON: function() 
        {
        return Hash.toJSON(this);
        }
    });

function $H(object) 
    {
    if (object instanceof Hash) 
        {
        return object;
        }
    return new Hash(object);
    };

// Safari iterates over shadowed properties
if (function() 
    {
    var i = 0;
    var Test = function(value) 
        { 
        this.key = value; 
        };
    Test.prototype.key = 'foo';
    for (var property in new Test('bar'))
        {
        i++;
        }
    return i > 1;
    }()) 

Hash.prototype._each = function(iterator) 
    {
    var cache = [];
    for (var key in this) 
        {
        var value = this[key];
        if ((value && value == Hash.prototype[key]) || cache.include(key)) 
            {
            continue;
            }
        cache.push(key);
        var pair = [key, value];
        pair.key = key;
        pair.value = value;
        iterator(pair);
        }
    };

ObjectRange = Class.create();
Object.extend(ObjectRange.prototype, Enumerable);
Object.extend(ObjectRange.prototype, 
    {
    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 XMLHttpRequest()},
            function() {return new ActiveXObject('Msxml2.XMLHTTP')},
            function() {return new ActiveXObject('Microsoft.XMLHTTP')}
            ) || 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 (typeof(responder[callback]) == 'function') 
                {
                try 
                    {
                    responder[callback].apply(responder, [request, transport, json]);
                    } 
                catch (ex) 
                    {
                    }
                }
            });
        }
    };

Object.extend(Ajax.Responders, Enumerable);

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

Ajax.Base = function() {};
Ajax.Base.prototype = 
    {
    setOptions: function(options) 
        {
        this.options = {
            method: 'post',
            asynchronous: true,
            contentType: 'application/x-www-form-urlencoded',
            encoding: 'UTF-8',
            parameters: ''
            }
        Object.extend(this.options, options || {});
        
        this.options.method = this.options.method.toLowerCase();
        if (typeof(this.options.parameters) == 'string')
            {
            this.options.parameters = this.options.parameters.toQueryParams();
            }
        }
    }

Ajax.Request = Class.create();
Ajax.Request.Events = ['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];

Ajax.Request.prototype = Object.extend(new Ajax.Base(), 
    {
    _complete: false,
    initialize: function(url, options) 
        {
        this.transport = Ajax.getTransport();
        this.setOptions(options);
        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 = Hash.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 
            {
            if (this.options.onCreate) 
                {
                this.options.onCreate(this.transport);
                }
            Ajax.Responders.dispatch('onCreate', this, this.transport);
            
            this.transport.open(this.method.toUpperCase(), this.url, this.options.asynchronous);
            
            if (this.options.asynchronous)
                {
                setTimeout(function() 
                    { 
                    this.respondToReadyState(1) 
                    }.bind(this), 10);
                }
                
            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 (ex) 
            {
            this.dispatchException(ex);
            }
        },
    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 (typeof(extras.push) == 'function')
                {
                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() 
        {
        return !this.transport.status || (this.transport.status >= 200 && this.transport.status < 300);
        },
    respondToReadyState: function(readyState) 
        {
        var state = Ajax.Request.Events[readyState];
        var transport = this.transport;
        var json = this.evalJSON();
        
        if (state == 'Complete') 
            {
            try 
                {
                this._complete = true;
                (this.options['on' + this.transport.status] || this.options['on' + (this.success() ? 'Success' : 'Failure')] || Prototype.emptyFunction)(transport, json);
                } 
            catch (ex) 
                {
                this.dispatchException(ex);
                }
            
            var contentType = this.getHeader('Content-type');
            if (contentType && contentType.strip().match(/^(text|application)\/(x-)?(java|ecma)script(;.*)?$/i))
                {
                this.evalResponse();
                }
            }
            
        try 
            {
            (this.options['on' + state] || Prototype.emptyFunction)(transport, json);
            Ajax.Responders.dispatch('on' + state, this, transport, json);
            } 
        catch (ex) 
            {
            this.dispatchException(ex);
            }
            
        if (state == 'Complete') 
            {
            // avoid memory leak in MSIE: clean up
            this.transport.onreadystatechange = Prototype.emptyFunction;
            }
        },
    getHeader: function(name) 
        {
        try 
            {
            return this.transport.getResponseHeader(name);
            } 
        catch (ex) 
            { 
            return null;
            }
        },
    evalJSON: function() 
        {
        try 
            {
            var json = this.getHeader('X-JSON');
            return json ? json.evalJSON() : null;
            } 
        catch (ex) 
            { 
            return null; 
            }
        },
    evalResponse: function() 
        {
        try 
            {
            return eval((this.transport.responseText || '').unfilterJSON());
            } 
        catch (ex) 
            {
            this.dispatchException(ex);
            }
        },
    dispatchException: function(exception) 
        {
        (this.options.onException || Prototype.emptyFunction)(this, exception);
        Ajax.Responders.dispatch('onException', this, exception);
        }
    });

Ajax.Updater = Class.create();

Object.extend(Object.extend(Ajax.Updater.prototype, Ajax.Request.prototype), 
    {
    initialize: function(container, url, options) 
        {
        this.container = {
            success: (container.success || container),
            failure: (container.failure || (container.success ? null : container))
            }
            
        this.transport = Ajax.getTransport();
        this.setOptions(options);
        
        var onComplete = this.options.onComplete || Prototype.emptyFunction;
        this.options.onComplete = (function(transport, param) 
            {
            this.updateContent();
            onComplete(transport, param);
            }).bind(this);
            
        this.request(url);
        },
    updateContent: function() 
        {
        var receiver = this.container[this.success() ? 'success' : 'failure'];
        var response = this.transport.responseText;
        
        if (!this.options.evalScripts) 
            {
            response = response.stripScripts();
            }
            
        if (receiver = $(receiver)) 
            {
            if (this.options.insertion)
                {
                new this.options.insertion(receiver, response);
                }
            else
                {
                receiver.update(response);
                }
            }
        
        if (this.success()) 
            {
            if (this.onComplete)
                {
                setTimeout(this.onComplete.bind(this), 10);
                }
            }
        }
    });

Ajax.PeriodicalUpdater = Class.create();
Ajax.PeriodicalUpdater.prototype = Object.extend(new Ajax.Base(), 
    {
    initialize: function(container, url, options) 
        {
        this.setOptions(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(request) 
        {
        if (this.options.decay) 
            {
            this.decay = (request.responseText == this.lastText ? this.decay * this.options.decay : 1);
            this.lastText = request.responseText;
            }
        this.timer = setTimeout(this.onTimerEvent.bind(this), this.decay * this.frequency * 1000);
        },
    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 (typeof(element) == 'string')
        {
        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(query.snapshotItem(i));
            }
        return results;
        };
        
    document.getElementsByClassName = function(className, parentElement) 
        {
        var q = ".//*[contains(concat(' ', @class, ' '), ' " + className + " ')]";
        return document._getElementsByXPath(q, parentElement);
        }
    } 
else 
    {
    document.getElementsByClassName = function(className, parentElement) 
        {
        var children = ($(parentElement) || document.body).getElementsByTagName('*');
        var elements = [], child, pattern = new RegExp("(^|\\s)" + className + "(\\s|$)");
        for (var i = 0, length = children.length; i < length; i++) 
            {
            child = children[i];
            var elementClassName = child.className;
            if (elementClassName.length == 0) 
                {
                continue;
                }
            if (elementClassName == className || elementClassName.match(pattern))
                {
                elements.push(Element.extend(child));
                }
            }
        return elements;
        };
    }

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

Element.extend = function(element) 
    {
    var F = Prototype.BrowserFeatures;
    if (!element || !element.tagName || element.nodeType == 3 || element._extended || F.SpecificElementExtensions || element == window)
        {
        return element;
        }
    
    var methods = {};
    var tagName = element.tagName;
    var cache = Element.extend.cache
    var T = Element.Methods.ByTag;
    
    // extend methods for all tags (Safari doesn't need this)
    if (!F.ElementExtensions) 
        {
        Object.extend(methods, Element.Methods), Object.extend(methods, Element.Methods.Simulated);
        }

    // extend methods for specific tags
    if (T[tagName]) 
        {
        Object.extend(methods, T[tagName]);
        }
        
    for (var property in methods) 
        {
        var value = methods[property];
        if (typeof(value) == 'function' && !(property in element))
            {
            element[property] = cache.findOrStore(value);
            }
        }
        
    element._extended = Prototype.emptyFunction;
    return element;
    };

Element.extend.cache = 
    {
    findOrStore: function(value) 
        {
        return this[value] = this[value] || function() 
            {
            return value.apply(null, [this].concat($A(arguments)));
            }
        }
    };

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).style.display = 'none';
        return element;
        },
    show: function(element) 
        {
        $(element).style.display = '';
        return element;
        },
    remove: function(element) 
        {
        element = $(element);
        element.parentNode.removeChild(element);
        return element;
        },
    update: function(element, html) 
        {
        html = typeof(html) == 'undefined' ? '' : html.toString();
        $(element).innerHTML = html.stripScripts();
        setTimeout(function() {html.evalScripts()}, 10);
        return element;
        },
    replace: function(element, html) 
        {
        element = $(element);
        html = typeof(html) == 'undefined' ? '' : html.toString();
        if (element.outerHTML) 
            {
            element.outerHTML = html.stripScripts();
            } 
        else 
            {
            var range = element.ownerDocument.createRange();
            range.selectNodeContents(element);
            element.parentNode.replaceChild(range.createContextualFragment(html.stripScripts()), element);
            }
        setTimeout(function() 
            {
            html.evalScripts()
            }, 10);
        return element;
        },
    inspect: function(element) 
        {
        element = $(element);
        var result = '<' + element.tagName.toLowerCase();
        $H({'id': 'id', 'className': 'class'}).each(function(pair) 
            {
            var property = pair.first();
            var 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 $A($(element).getElementsByTagName('*')).each(Element.extend);
        },
    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 = $(element);
        return element.previousSiblings().reverse().concat(element.nextSiblings());
        },
    match: function(element, selector) 
        {
        if (typeof(selector) == 'string')
            {
            selector = new Selector(selector);
            }
        return selector.match($(element));
        },
    up: function(element, expression, index) 
        {
        element = $(element);
        if (arguments.length == 1) 
            {
            return $(element.parentNode);
            }
        var ancestors = element.ancestors();
        return expression ? Selector.findElement(ancestors, expression, index) : ancestors[index || 0];
        },
    down: function(element, expression, index) 
        {
        element = $(element);
        if (arguments.length == 1) 
            {
            return element.firstDescendant();
            }
        var descendants = element.descendants();
        return expression ? Selector.findElement(descendants, expression, index) : descendants[index || 0];
        },
    previous: function(element, expression, index) 
        {
        element = $(element);
        if (arguments.length == 1) 
            {
            return $(Selector.handlers.previousElementSibling(element));
            }
        var previousSiblings = element.previousSiblings();
        return expression ? Selector.findElement(previousSiblings, expression, index) : previousSiblings[index || 0];
        },
    next: function(element, expression, index) 
        {
        element = $(element);
        if (arguments.length == 1) 
            {
            return $(Selector.handlers.nextElementSibling(element));
            }
        var nextSiblings = element.nextSiblings();
        return expression ? Selector.findElement(nextSiblings, expression, index) : nextSiblings[index || 0];
        },
    getElementsBySelector: function() 
        {
        var args = $A(arguments), element = $(args.shift());
        return Selector.findChildElements(element, args);
        },
    getElementsByClassName: function(element, className) 
        {
        return document.getElementsByClassName(className, element);
        },
    readAttribute: function(element, name) 
        {
        element = $(element);
        if (Prototype.Browser.IE) 
            {
            if (!element.attributes) 
                {
                return null;
                }
            var t = Element._attributeTranslations;
            if (t.values[name]) 
                {
                return t.values[name](element, name);
                }
            if (t.names[name])  
                {
                name = t.names[name];
                }
            var attribute = element.attributes[name];
            return attribute ? attribute.nodeValue : null;
            }
        return element.getAttribute(name);
        },
    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 = $(element))) 
            {
            return;
            }    
        var elementClassName = element.className;
        if (elementClassName.length == 0) 
            {
            return false;
            }
        if (elementClassName == className || elementClassName.match(new RegExp("(^|\\s)" + className + "(\\s|$)")))
            {
            return true;
            }
        return false;
        },
    addClassName: function(element, className) 
        {
        if (!(element = $(element))) 
            {
            return;
            }
        Element.classNames(element).add(className);
        return element;
        },
    removeClassName: function(element, className) 
        {
        if (!(element = $(element))) 
            {
            return;
            }
        Element.classNames(element).remove(className);
        return element;
        },
    toggleClassName: function(element, className) 
        {
        if (!(element = $(element))) 
            {
            return;
            }
        Element.classNames(element)[element.hasClassName(className) ? 'remove' : 'add'](className);
        return element;
        },
    observe: function() 
        {
        Event.observe.apply(Event, arguments);
        return $A(arguments).first();
        },
    stopObserving: function() 
        {
        Event.stopObserving.apply(Event, arguments);
        return $A(arguments).first();
        },
    // 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);
        while (element = element.parentNode)
            {
            if (element == ancestor) 
                {
                return true;
                }
            }
        return false;
        },
    scrollTo: function(element) 
        {
        element = $(element);
        var pos = Position.cumulativeOffset(element);
        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) 
            {
            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, camelized) 
        {
        element = $(element);
        var elementStyle = element.style;
        
        for (var property in styles)
            {
            if (property == 'opacity') 
                {
                element.setOpacity(styles[property])
                }
            else
                {
                elementStyle[(property == 'float' || property == 'cssFloat') ? (elementStyle.styleFloat === undefined ? 'cssFloat' : 'styleFloat') : (camelized ? property : property.camelize())] = 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');
        if (display != 'none' && display != null) 
            {
            // Safari bug
            return {width: element.offsetWidth, height: element.offsetHeight};
            }
            
        // All *Width and *Height properties give 0 on elements with display none,
        // so enable the element temporarily
        var els = element.style;
        var originalVisibility = els.visibility;
        var originalPosition = els.position;
        var originalDisplay = els.display;
        els.visibility = 'hidden';
        els.position = 'absolute';
        els.display = 'block';
        var originalWidth = element.clientWidth;
        var originalHeight = element.clientHeight;
        els.display = originalDisplay;
        els.position = originalPosition;
        els.visibility = originalVisibility;
        return {width: originalWidth, height: originalHeight};
        },
    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 (window.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.style.overflow || 'auto';
        if ((Element.getStyle(element, 'overflow') || 'visible') != '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;
        }
    };

Object.extend(Element.Methods, 
    {
    childOf: Element.Methods.descendantOf,
    childElements: Element.Methods.immediateDescendants
    });

if (Prototype.Browser.Opera) 
    {
    Element.Methods._getStyle = Element.Methods.getStyle;
    Element.Methods.getStyle = function(element, style) 
        {
        switch(style) 
            {
            case 'left':
            case 'top':
            case 'right':
            case 'bottom':
                if (Element._getStyle(element, 'position') == 'static') 
                    {
                    return null;
                    }
            default: 
                return Element._getStyle(element, style);
            }
        };
    }
else if (Prototype.Browser.IE) 
    {
    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) 
        {
        element = $(element);
        var filter = element.getStyle('filter'), style = element.style;
        if (value == 1 || value === '') 
            {
            style.filter = filter.replace(/alpha\([^\)]*\)/gi,'');
            return element;
            } 
        else if (value < 0.00001) 
            {
            value = 0;
            }
        style.filter = filter.replace(/alpha\([^\)]*\)/gi, '') + 'alpha(opacity=' + (value * 100) + ')';
        return element;
        };
    // IE is missing .innerHTML support for TABLE-related elements
    Element.Methods.update = function(element, html) 
        {
        element = $(element);
        html = typeof(html) == 'undefined' ? '' : html.toString();
        var tagName = element.tagName.toUpperCase();
        if (['THEAD','TBODY','TR','TD'].include(tagName)) 
            {
            var div = document.createElement('div');
            switch (tagName) 
                {
                case 'THEAD':
                case 'TBODY':
                    div.innerHTML = '<table><tbody>' +  html.stripScripts() + '</tbody></table>';
                    depth = 2;
                    break;
                case 'TR':
                    div.innerHTML = '<table><tbody><tr>' +  html.stripScripts() + '</tr></tbody></table>';
                    depth = 3;
                    break;
                case 'TD':
                    div.innerHTML = '<table><tbody><tr><td>' +  html.stripScripts() + '</td></tr></tbody></table>';
                    depth = 4;
                }
            $A(element.childNodes).each(function(node) 
                { 
                element.removeChild(node) 
                });
            depth.times(function() 
                { 
                div = div.firstChild 
                });
            $A(div.childNodes).each(function(node) 
                { 
                element.appendChild(node) 
                });
            } 
        else 
            {
            element.innerHTML = html.stripScripts();
            }
        setTimeout(function() 
            { 
            html.evalScripts() 
            }, 10);
        return element;
        }
    }
else if (Prototype.Browser.Gecko) 
    {
    Element.Methods.setOpacity = function(element, value) 
        {
        element = $(element);
        element.style.opacity = (value == 1) ? 0.999999 : (value === '') ? '' : (value < 0.00001) ? 0 : value;
        return element;
        };
    }

Element._attributeTranslations = 
    {
    names: {
        colspan:   "colSpan",
        rowspan:   "rowSpan",
        valign:    "vAlign",
        datetime:  "dateTime",
        accesskey: "accessKey",
        tabindex:  "tabIndex",
        enctype:   "encType",
        maxlength: "maxLength",
        readonly:  "readOnly",
        longdesc:  "longDesc"
        },
    values: {
        _getAttr: function(element, attribute) 
            {
            return element.getAttribute(attribute, 2);
            },
        _flag: function(element, attribute) 
            {
            return $(element).hasAttribute(attribute) ? attribute : null;
            },
        style: function(element) 
            {
            return element.style.cssText.toLowerCase();
            },
        title: function(element) 
            {
            var node = element.getAttributeNode('title');
            return node.specified ? node.nodeValue : null;
            }
        }
    };

(function() 
    {
    Object.extend(this, 
        {
        href: this._getAttr,
        src:  this._getAttr,
        type: this._getAttr,
        disabled: this._flag,
        checked:  this._flag,
        readonly: this._flag,
        multiple: this._flag
        });
    }).call(Element._attributeTranslations.values);

Element.Methods.Simulated = 
    {
    hasAttribute: function(element, attribute) 
        {
        var t = Element._attributeTranslations, node;
        attribute = t.names[attribute] || attribute;
        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.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;
    var T = Element.Methods.ByTag;
    
    if (!methods) 
        {
        Object.extend(Form, Form.Methods);
        Object.extend(Form.Element, Form.Element.Methods);
        Object.extend(Element.Methods.ByTag, 
            {
            "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 (tagName.constructor == Array) 
            {
            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;
        var cache = Element.extend.cache;
        for (var property in methods) 
            {
            var value = methods[property];
            if (!onlyIfAbsent || !(property in destination))
                {
                destination[property] = cache.findOrStore(value);
                }
            }
        }
        
    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 (typeof(klass) == "undefined") 
                {
                continue;
                }
            copy(T[tag], klass.prototype);
            }
        }
    
    Object.extend(Element, Element.Methods);
    delete Element.ByTag;
    };

var Toggle = { display: Element.toggle };

Abstract.Insertion = function(adjacency)
    {
    this.adjacency = adjacency;
    }

Abstract.Insertion.prototype = 
    {
    initialize: function(element, content) 
        {
        this.element = $(element);
        this.content = content.stripScripts();
        
        if (this.adjacency && this.element.insertAdjacentHTML) 
            {
            try 
                {
                this.element.insertAdjacentHTML(this.adjacency, this.content);
                } 
            catch (ex) 
                {
                var tagName = this.element.tagName.toUpperCase();
                if (['TBODY', 'TR'].include(tagName)) 
                    {
                    this.insertContent(this.contentFromAnonymousTable());
                    } 
                else 
                    {
                    throw ex;
                    }
                }
            } 
        else 
            {
            this.range = this.element.ownerDocument.createRange();
            if (this.initializeRange) 
                {
                this.initializeRange();
                }
            this.insertContent([this.range.createContextualFragment(this.content)]);
            }
            
        setTimeout(function() 
            {
            content.evalScripts()
            }, 10);
        },
    contentFromAnonymousTable: function() 
        {
        var div = document.createElement('div');
        div.innerHTML = '<table><tbody>' + this.content + '</tbody></table>';
        return $A(div.childNodes[0].childNodes[0].childNodes);
        }
    }

var Insertion = new Object();

Insertion.Before = Class.create();
Insertion.Before.prototype = Object.extend(new Abstract.Insertion('beforeBegin'), 
    {
    initializeRange: function() 
        {
        this.range.setStartBefore(this.element);
        },
    insertContent: function(fragments) 
        {
        fragments.each((function(fragment) 
            {
            this.element.parentNode.insertBefore(fragment, this.element);
            }).bind(this));
        }
    });
    
Insertion.Top = Class.create();
Insertion.Top.prototype = Object.extend(new Abstract.Insertion('afterBegin'), 
    {
    initializeRange: function() 
        {
        this.range.selectNodeContents(this.element);
        this.range.collapse(true);
        },
    insertContent: function(fragments) 
        {
        fragments.reverse(false).each((function(fragment) 
            {
            this.element.insertBefore(fragment, this.element.firstChild);
            }).bind(this));
        }
    });

Insertion.Bottom = Class.create();
Insertion.Bottom.prototype = Object.extend(new Abstract.Insertion('beforeEnd'), 
    {
    initializeRange: function() 
        {
        this.range.selectNodeContents(this.element);
        this.range.collapse(this.element);
        },
    insertContent: function(fragments) 
        {
        fragments.each((function(fragment) 
            {
            this.element.appendChild(fragment);
            }).bind(this));
        }
    });

Insertion.After = Class.create();
Insertion.After.prototype = Object.extend(new Abstract.Insertion('afterEnd'), 
    {
    initializeRange: function() 
        {
        this.range.setStartAfter(this.element);
        },
    insertContent: function(fragments) 
        {
        fragments.each((function(fragment) 
            {
            this.element.parentNode.insertBefore(fragment, this.element.nextSibling);
            }).bind(this));
        }
    });

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);

/* 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();

Selector.prototype = 
    {
    initialize: function(expression) 
        {
        this.expression = expression.strip();
        this.compileMatcher();
        },
    compileMatcher: function() 
        {
        // Selectors with namespaced attributes can't use the XPath version
        if (Prototype.BrowserFeatures.XPath && !(/\[[\w-]*?:/).test(this.expression))
            {
            return this.compileXPathMatcher();
            }
        
        var e = this.expression;
        var ps = Selector.patterns;
        var h = Selector.handlers;
        var c = Selector.criteria;
        var le;
        var p;
        var 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(typeof(c[i]) == 'function' ? 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;
        var ps = Selector.patterns;
        var x = Selector.xpath;
        var le;
        var 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(typeof(x[i]) == 'function' ? 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;
        if (this.xpath) 
            {
            return document._getElementsByXPath(this.xpath, root);
            }
        return this.matcher(root);
        },
    match: function(element) 
        {
        return this.findElements(document).include(element);
        },
    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: "[@#{1}]",
        attr: function(m) 
            {
            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 (typeof(h) === 'function') 
                {
                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 or translate(text(), ' \t\r\n', '') = '')]",
            'checked': "[@checked]",
            'disabled': "[@disabled]",
            'enabled': "[not(@disabled)]",
            'not': function(m) 
                {
                var e = m[6];
                var p = Selector.patterns;
                var x = Selector.xpath;
                var le;
                var m;
                var v;
                
                var exclusion = [];
                while (e && le != e && (/\S/).test(e)) 
                    {
                    le = e;
                    for (var i in p) 
                        {
                        if (m = e.match(p[i])) 
                            {
                            v = typeof(x[i]) == 'function' ? 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;
                var formula = m[6];
                var 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 = false;',
        attr: function(m) 
            {
            m[3] = (m[5] || m[6]);
            return new Template('n = h.attr(n, r, "#{1}", "#{3}", "#{2}"); 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: /^\[([\w]+)\]/,
        attr: /\[((?:[\w-]*:)?[\w-]+)\s*(?:([!^$*~|]?=)\s*((['"])([^\]]*?)\4|([^'"][^\]]*?)))?\]/
        },
    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) 
            {
            for (var i = 0, node; node = nodes[i]; i++)
                {
                node._counted = true;
                }
            return nodes;
            },
        unmark: function(nodes) 
            {
            for (var i = 0, node; node = nodes[i]; i++)
                {
                node._counted = 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._counted = true;
            if (reverse) 
                {
                for (var nodes = parentNode.childNodes, i = nodes.length - 1, j = 1; i >= 0; i--) 
                    {
                    node = nodes[i];
                    if (node.nodeType == 1 && (!ofType || node._counted)) 
                        {
                        node.nodeIndex = j++;
                        }
                    }
                } 
            else 
                {
                for (var i = 0, j = 1, nodes = parentNode.childNodes; node = nodes[i]; i++)
                    {
                    if (node.nodeType == 1 && (!ofType || node._counted)) 
                        {
                        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])._counted) 
                    {
                    n._counted = true;
                    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, children = [], 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) 
            {
            tagName = tagName.toUpperCase();
            var results = [];
            var 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() == tagName) 
                        {
                        results.push(node);
                        }
                    }
                return results;
                } 
            else 
                {
                return root.getElementsByTagName(tagName);
                }
            },
        id: function(nodes, root, id, combinator) 
            {
            var targetNode = $(id);
            var h = Selector.handlers;
            if (!nodes && root == document) 
                {
                return targetNode ? [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) 
            {
            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) 
            {
            if (!nodes) 
                {
                nodes = root.getElementsByTagName("*");
                }
            var handler = Selector.operators[operator];
            var 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 $R(1, total).inject([], function(memo, i) 
                {
                if (0 == (i - b) % a && (i - b) / a >= 0) 
                    {
                    memo.push(i);
                    }
                return memo;
                });
            },
        // handles nth(-last)-child, nth(-last)-of-type, and (first|last)-of-type
        nth: function(nodes, formula, root, reverse, ofType) 
            {
            if (nodes.length == 0) 
                {
                return [];
                }
            if (formula == 'even') 
                {
                formula = '2n+0';
                }
            if (formula == 'odd')
                {
                formula = '2n+1';
                }
            var h = Selector.handlers;
            var results = [];
            var indexed = [];
            var m;
            h.mark(nodes);
            for (var i = 0, node; node = nodes[i]; i++) 
                {
                if (!node.parentNode._counted) 
                    {
                    h.index(node.parentNode, reverse, ofType);
                    indexed.push(node.parentNode);
                    }
                }
            if (formula.match(/^\d+$/)) 
                { 
                // 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 && !node.innerHTML.match(/^\s*$/))) 
                    {
                    continue;
                    }
                results.push(node);
                }
            return results;
            },
        'not': function(nodes, selector, root) 
            {
            var h = Selector.handlers;
            var selectorType;
            var m;
            var exclusions = new Selector(selector).findElements(root);
            h.mark(exclusions);
            for (var i = 0, results = [], node; node = nodes[i]; i++)
                {
                if (!node._counted) 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) 
                    {
                    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.startsWith(v); 
            },
        '$=': function(nv, v) 
            { 
            return nv.endsWith(v); 
            },
        '*=': function(nv, v) 
            { 
            return nv.include(v); 
            },
        '~=': function(nv, v) 
            { 
            return (' ' + nv + ' ').include(' ' + v + ' '); 
            },
        '|=': function(nv, v) 
            { 
            return ('-' + nv.toUpperCase() + '-').include('-' + v.toUpperCase() + '-'); 
            }
        },
    matchElements: function(elements, expression) 
        {
        var matches = new Selector(expression).findElements();
        var h = Selector.handlers;
        h.mark(matches);
        for (var i = 0, results = [], element; element = elements[i]; i++)
            {
            if (element._counted) 
                {
                results.push(element);
                }
            }
        h.unmark(matches);
        return results;
        },
    findElement: function(elements, expression, index) 
        {
        if (typeof(expression) == 'number') 
            {
            index = expression; 
            expression = false;
            }
        return Selector.matchElements(elements, expression || '*')[index || 0];
        },
    findChildElements: function(element, expressions) 
        {
        var exprs = expressions.join(',');
        var expressions = [];
        exprs.scan(/(([\w#:.~>+()\s-]+|\*|\[.*?\])+)\s*(,|$)/, function(m) 
            {
            expressions.push(m[1].strip());
            });
        var results = [];
        var 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;
        }
    });

function $$() 
    {
    return Selector.findChildElements(document, $A(arguments));
    }

var Form = 
    {
    reset: function(form) 
        {
        $(form).reset();
        return form;
        },
    serializeElements: function(elements, getHash) 
        {
        var data = elements.inject({}, function(result, element) 
            {
            if (!element.disabled && element.name) 
                {
                var key = element.name;
                var value = $(element).getValue();
                if (value != null) 
                    {
                    if (key in result) 
                        {
                        if (result[key].constructor != Array) 
                            {
                            result[key] = [result[key]];
                            }
                        result[key].push(value);
                        }
                    else 
                        {
                        result[key] = value;
                        }
                    }
                }
            return result;
            });
        
        return getHash ? data : Hash.toQueryString(data);
        }
    };

Form.Methods = 
    {
    serialize: function(form, getHash) 
        {
        return Form.serializeElements(Form.getElements(form), getHash);
        },
    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) 
        {
        return $(form).getElements().find(function(element) 
            {
            return element.type != 'hidden' && !element.disabled && ['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;
        options.parameters = form.serialize(true);
        
        if (params) 
            {
            if (typeof(params) == 'string') 
                {
                params = params.toQueryParams();
                }
            Object.extend(options.parameters, params);
            }
            
        if (form.hasAttribute('method') && !options.method)
            {
            options.method = form.method;
            }
        return new Ajax.Request(form.readAttribute('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 Hash.toQueryString(pair);
                }
            }
        return '';
        },
    getValue: function(element) 
        {
        element = $(element);
        var method = element.tagName.toLowerCase();
        return Form.Element.Serializers[method](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', 'reset', 'submit'].include(element.type)))
                {
                element.select();
                }
            } 
        catch (ex) 
            {
            }
        return element;
        },
    disable: function(element) 
        {
        element = $(element);
        element.blur();
        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) 
        {
        switch (element.type.toLowerCase()) 
            {
            case 'checkbox':
            case 'radio':
                return Form.Element.Serializers.inputSelector(element);
            default:
                return Form.Element.Serializers.textarea(element);
            }
        },
    inputSelector: function(element) 
        {
        return element.checked ? element.value : null;
        },
    textarea: function(element) 
        {
        return element.value;
        },
    select: function(element) 
        {
        return this[element.type == 'select-one' ? 'selectOne' : 'selectMany'](element);
        },
    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 = function() {}
Abstract.TimedObserver.prototype = 
    {
    initialize: function(element, frequency, callback) 
        {
        this.frequency = frequency;
        this.element   = $(element);
        this.callback  = callback;
        
        this.lastValue = this.getValue();
        this.registerCallback();
        },
    registerCallback: function() 
        {
        setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
        },
    onTimerEvent: function() 
        {
        var value = this.getValue();
        var changed = ('string' == typeof(this.lastValue) && 'string' == typeof(value) ? this.lastValue != value : String(this.lastValue) != String(value));
        if (changed) 
            {
            this.callback(this.element, value);
            this.lastValue = value;
            }
        }
    }

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

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

Abstract.EventObserver = function() {}
Abstract.EventObserver.prototype = 
    {
    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.bind(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();
Form.Element.EventObserver.prototype = Object.extend(new Abstract.EventObserver(), 
    {
    getValue: function() 
        {
        return Form.Element.getValue(this.element);
        }
    });

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

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,
    element: function(event) 
        {
        return $(event.target || event.srcElement);
        },
    isLeftClick: function(event) 
        {
        return (((event.which) && (event.which == 1)) || ((event.button) && (event.button == 1)));
        },
    pointerX: function(event) 
        {
        return event.pageX || (event.clientX + (document.documentElement.scrollLeft || document.body.scrollLeft));
        },
    pointerY: function(event) 
        {
        return event.pageY || (event.clientY + (document.documentElement.scrollTop || document.body.scrollTop));
        },
    stop: function(event) 
        {
        if (event.preventDefault) 
            {
            event.preventDefault();
            event.stopPropagation();
            } 
        else 
            {
            event.returnValue = false;
            event.cancelBubble = true;
            }
        },
    // find the first node with the given tagName, starting from the
    // node the event was triggered on; traverses the DOM upwards
    findElement: function(event, tagName) 
        {
        var element = Event.element(event);
        while (element.parentNode && (!element.tagName || (element.tagName.toUpperCase() != tagName.toUpperCase())))
            {
            element = element.parentNode;
            }
        return element;
        },
    observers: false,
    _observeAndCache: function(element, name, observer, useCapture) 
        {
        if (!this.observers) 
            {
            this.observers = [];
            }
        if (element.addEventListener) 
            {
            this.observers.push([element, name, observer, useCapture]);
            element.addEventListener(name, observer, useCapture);
            } 
        else if (element.attachEvent) 
            {
            this.observers.push([element, name, observer, useCapture]);
            element.attachEvent('on' + name, observer);
            }
        },
    unloadCache: function() 
        {
        if (!Event.observers) 
            {
            return;
            }
        for (var i = 0, length = Event.observers.length; i < length; i++) 
            {
            Event.stopObserving.apply(this, Event.observers[i]);
            Event.observers[i][0] = null;
            }
        Event.observers = false;
        },
    observe: function(element, name, observer, useCapture) 
        {
        element = $(element);
        useCapture = useCapture || false;
        
        if (name == 'keypress' && (Prototype.Browser.WebKit || element.attachEvent))
            {
            name = 'keydown';
            }
        Event._observeAndCache(element, name, observer, useCapture);
        },
    stopObserving: function(element, name, observer, useCapture) 
        {
        element = $(element);
        useCapture = useCapture || false;
        
        if (name == 'keypress' && (Prototype.Browser.WebKit || element.attachEvent))
            {
            name = 'keydown';
            }
            
        if (element.removeEventListener) 
            {
            element.removeEventListener(name, observer, useCapture);
            } 
        else if (element.detachEvent) 
            {
            try     
                {
                element.detachEvent('on' + name, observer);
                } 
            catch (ex) 
                {
                }
            }
        }
    });

/* prevent memory leaks in IE /
if (Prototype.Browser.IE)
    {
    Event.observe(window, 'unload', Event.unloadCache, false);
    }

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;
        },
    realOffset: function(element) 
        {
        var valueT = 0;
        var valueL = 0;
        do 
            {
            valueT += element.scrollTop || 0;
            valueL += element.scrollLeft || 0;
            element = element.parentNode;
            } while (element);
        return [valueL, valueT];
        },
    cumulativeOffset: function(element) 
        {
        var valueT = 0;
        var valueL = 0;
        do 
            {
            valueT += element.offsetTop || 0;
            valueL += element.offsetLeft || 0;
            element = element.offsetParent;
            } while (element);
        return [valueL, valueT];
        },
    positionedOffset: function(element) 
        {
        var valueT = 0;
        var valueL = 0;
        do 
            {
            valueT += element.offsetTop || 0;
            valueL += element.offsetLeft || 0;
            element = element.offsetParent;
            if (element) 
                {
                if (element.tagName == 'BODY') 
                    {
                    break;
                    }
                var p = Element.getStyle(element, 'position');
                if (p == 'relative' || p == 'absolute') 
                    {
                    break;
                    }
                }
            } while (element);
        return [valueL, valueT];
        },
    offsetParent: function(element) 
        {
        if (element.offsetParent)   
            {
            return element.offsetParent;
            }
        if (element == document.body) 
            {
            return element;
            }
            
        while ((element = element.parentNode) && element != document.body)
            {
            if (Element.getStyle(element, 'position') != 'static')
                {
                return element;
                }
            }
        return document.body;
        },
    // caches x/y coordinate pair to use with overlap
    within: function(element, x, y) 
        {
        if (this.includeScrollOffsets)
            {
            return this.withinIncludingScrolloffsets(element, x, y);
            }
        this.xcomp = x;
        this.ycomp = y;
        this.offset = this.cumulativeOffset(element);

        return (y >= this.offset[1] && y <  this.offset[1] + element.offsetHeight && x >= this.offset[0] && x <  this.offset[0] + element.offsetWidth);
        },
    withinIncludingScrolloffsets: function(element, x, y) 
        {
        var offsetcache = this.realOffset(element);
        
        this.xcomp = x + offsetcache[0] - this.deltaX;
        this.ycomp = y + offsetcache[1] - this.deltaY;
        this.offset = this.cumulativeOffset(element);

        return (this.ycomp >= this.offset[1] && this.ycomp <  this.offset[1] + element.offsetHeight && this.xcomp >= this.offset[0] && this.xcomp <  this.offset[0] + element.offsetWidth);
        },
    // within must be called directly before
    overlap: function(mode, element) 
        {
        if (!mode) 
            {
            return 0;
            }
        if (mode == 'vertical')
            {
            return ((this.offset[1] + element.offsetHeight) - this.ycomp) / element.offsetHeight;
            }
        if (mode == 'horizontal')
            {
            return ((this.offset[0] + element.offsetWidth) - this.xcomp) / element.offsetWidth;
            }
        },
    page: function(forElement) 
        {
        var valueT = 0;
        var valueL = 0;
        
        var element = forElement;
        do 
            {
            valueT += element.offsetTop  || 0;
            valueL += element.offsetLeft || 0;
            
            // Safari fix
            if (element.offsetParent == document.body)
                {
                if (Element.getStyle(element,'position')=='absolute') 
                    {
                    break;
                    }
                }
            } while (element = element.offsetParent);

        element = forElement;
        do 
            {
            if (!window.opera || element.tagName=='BODY') 
                {
                valueT -= element.scrollTop  || 0;
                valueL -= element.scrollLeft || 0;
                }
            } while (element = element.parentNode);
            
        return [valueL, valueT];
        },
    clone: function(source, target) 
        {
        var options = Object.extend(
            {
            setLeft: true,
            setTop: true,
            setWidth: true,
            setHeight: true,
            offsetTop: 0,
            offsetLeft: 0
            }, arguments[2] || {})
            
        // find page position of source
        source = $(source);
        var p = Position.page(source);

        // find coordinate system to use
        target = $(target);
        var delta = [0, 0];
        var parent = null;
        // delta [0,0] will do fine with position: fixed elements,
        // position:absolute needs offsetParent deltas
        if (Element.getStyle(target,'position') == 'absolute') 
            {
            parent = Position.offsetParent(target);
            delta = Position.page(parent);
            }
            
        // correct by body offsets (fixes Safari)
        if (parent == document.body) 
            {
            delta[0] -= document.body.offsetLeft;
            delta[1] -= document.body.offsetTop;
            }
            
        // set position
        if(options.setLeft)
            {
            target.style.left  = (p[0] - delta[0] + options.offsetLeft) + 'px';
            }
        if(options.setTop)
            {
            target.style.top   = (p[1] - delta[1] + options.offsetTop) + 'px';
            }
        if(options.setWidth)  
            {
            target.style.width = source.offsetWidth + 'px';
            }
        if(options.setHeight) 
            {
            target.style.height = source.offsetHeight + 'px';
            }
        },
    absolutize: function(element) 
        {
        element = $(element);
        if (element.style.position == 'absolute') 
            {
            return;
            }
        Position.prepare();
        
        var offsets = Position.positionedOffset(element);
        var top = offsets[1];
        var left = offsets[0];
        var width = element.clientWidth;
        var height = element.clientHeight;

        element._originalLeft = left - parseFloat(element.style.left  || 0);
        element._originalTop = top - parseFloat(element.style.top || 0);
        element._originalWidth = element.style.width;
        element._originalHeight = element.style.height;

        element.style.position = 'absolute';
        element.style.top = top + 'px';
        element.style.left = left + 'px';
        element.style.width = width + 'px';
        element.style.height = height + 'px';
        },
    relativize: function(element) 
        {
        element = $(element);
        if (element.style.position == 'relative') 
            {
            return;
            }
        Position.prepare();

        element.style.position = 'relative';
        var top = parseFloat(element.style.top || 0) - (element._originalTop || 0);
        var left = parseFloat(element.style.left || 0) - (element._originalLeft || 0);
        
        element.style.top = top + 'px';
        element.style.left = left + 'px';
        element.style.height = element._originalHeight;
        element.style.width = element._originalWidth;
        }
    }
*/