/*  Prototype JavaScript framework, version 1.6.0
 *  (c) 2005-2007 Sam Stephenson
 *
 *  Prototype is freely distributable under the terms of an MIT-style license.
 *  For details, see the Prototype web site: http://www.prototypejs.org/
 *
 *--------------------------------------------------------------------------*/

var Prototype = {
Version: '1.6.0',

         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,
        MobileSafari: !!navigator.userAgent.match(/Apple.*Mobile.*Safari/)
         },

BrowserFeatures: {
XPath: !!document.evaluate,
       ElementExtensions: !!window.HTMLElement,
       SpecificElementExtensions:
         document.createElement('div').__proto__ &&
         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 }
};

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

if (Prototype.Browser.WebKit)
  Prototype.BrowserFeatures.XPath = false;

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

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

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

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

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

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

          klass.prototype.constructor = klass;

          return klass;
        }
  };

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

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

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

return this;
}
};

var Abstract = { };

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

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

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

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

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

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

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

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

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

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

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

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

isArray: function(object) {
           return object && object.constructor === Array;
         },

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

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

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

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

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

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

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

bindAsEventListener: function() {
var __method = this, args = $A(arguments), object = args.shift();
return function(event) {
return __method.apply(object, [event || window.event].concat(args));
}
},

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

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

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

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

Function.prototype.defer = Function.prototype.delay.curry(0.01);

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

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

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

         return returnValue;
       }
};

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

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

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

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

this.registerCallback();
},

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

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

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

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

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

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

sub: function(pattern, replacement, count) {
replacement = this.gsub.prepareReplacement(replacement);
count = 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 String(this);
      },

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

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

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

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

extractScripts: function() {
                  var matchAll = new RegExp(Prototype.ScriptFragment, '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 = new Element('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 (!Object.isArray(hash[key])) hash[key] = [hash[key]];
                     hash[key].push(value);
                     }
                     else hash[key] = value;
                     }
                     return hash;
                     });
               },

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

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

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

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

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

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

            return camelized;
          },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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 (Object.isFunction(replacement)) return replacement;
  var template = new Template(replacement);
  return function(match) { return template.evaluate(match) };
};

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

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

with (String.prototype.escapeHTML) div.appendChild(text);

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

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

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

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

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

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

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

var $break = { };

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

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

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

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

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

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

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

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

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

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

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

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

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

inject: function(memo, iterator, context) {
          iterator = iterator.bind(context);
          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, context) {
       iterator = iterator ? iterator.bind(context) : Prototype.K;
       var result;
       this.each(function(value, index) {
           value = iterator(value, index);
           if (result == undefined || value >= result)
           result = value;
           });
       return result;
     },

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

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

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

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

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

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

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

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

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

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

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

if (Prototype.Browser.WebKit) {
  function $A(iterable) {
    if (!iterable) return [];
    if (!(Object.isFunction(iterable) && iterable == '[object NodeList]') &&
        iterable.toArray) return iterable.toArray();
    var length = iterable.length, results = new Array(length);
    while (length--) results[length] = iterable[length];
    return results;
  }
}

Array.from = $A;

Object.extend(Array.prototype, Enumerable);

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

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

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

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

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

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

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

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

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

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

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

intersect: function(array) {
             return this.uniq().findAll(function(item) {
                 return array.detect(function(value) { return item === value });
                 });
           },

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(', ') + ']';
        }
});

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

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

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

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

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

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

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

times: function(iterator) {
$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';
        }
});

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

var Hash = Class.create(Enumerable, (function() {
      if (function() {
        var i = 0, Test = function(value) { this.key = value };
        Test.prototype.key = 'foo';
        for (var property in new Test('bar')) i++;
        return i > 1;
        }()) {
      function each(iterator) {
      var cache = [];
      for (var key in this._object) {
      var value = this._object[key];
      if (cache.include(key)) continue;
      cache.push(key);
      var pair = [key, value];
      pair.key = key;
      pair.value = value;
      iterator(pair);
      }
      }
      } else {
      function each(iterator) {
        for (var key in this._object) {
          var value = this._object[key], pair = [key, value];
          pair.key = key;
          pair.value = value;
          iterator(pair);
        }
      }
      }

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

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

_each: each,

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

get: function(key) {
       return this._object[key];
     },

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

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

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

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

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

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

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

toQueryString: function() {
                 return this.map(function(pair) {
                     var key = encodeURIComponent(pair.key), values = pair.value;

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

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

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

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

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

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

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

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

var Ajax = {
getTransport: function() {
                return Try.these(
                    function() {return new 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 (Object.isFunction(responder[callback])) {
                try {
                responder[callback].apply(responder, [request, transport, json]);
                } catch (e) { }
                }
                });
          }
};

Object.extend(Ajax.Responders, Enumerable);

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

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

this.options.method = this.options.method.toLowerCase();
if (Object.isString(this.options.parameters))
this.options.parameters = this.options.parameters.toQueryParams();
}
});

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

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

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

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

this.parameters = params;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

status:      0,
  statusText: '',

  getStatus: Ajax.Request.prototype.getStatus,

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

getHeader: Ajax.Request.prototype.getHeader,

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

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

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

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

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

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

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

$super(url, options);
},

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

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

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

if (this.success()) {
  if (this.onComplete) this.onComplete.bind(this).defer();
}
}
});

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

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

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

this.start();
},

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

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

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

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

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

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

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

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

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

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

Element.cache = { };

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

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

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

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

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

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

          var content, t, range;

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

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

            content = Object.toHTML(content);

            range = element.ownerDocument.createRange();
            t.initializeRange(element, range);
            t.insert(element, range.createContextualFragment(content.stripScripts()));

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

          return element;
        },

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

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

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

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

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

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

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

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

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

readAttribute: function(element, name) {
                 element = $(element);
                 if (Prototype.Browser.IE) {
                   var t = Element._attributeTranslations.read;
                   if (t.values[name]) return t.values[name](element, name);
                   if (t.names[name]) name = t.names[name];
                   if (name.include(':')) {
                     return (!element.attributes || !element.attributes[name]) ? null :
                       element.attributes[name].value;
                   }
                 }
                 return element.getAttribute(name);
               },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

                if (element.sourceIndex && !Prototype.Browser.Opera) {
                  var e = element.sourceIndex, a = ancestor.sourceIndex,
                      nextAncestor = ancestor.nextSibling;
                  if (!nextAncestor) {
                    do { ancestor = ancestor.parentNode; }
                    while (!(nextAncestor = ancestor.nextSibling) && ancestor.parentNode);
                  }
                  if (nextAncestor) return (e > a && e < nextAncestor.sourceIndex);
                }

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

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

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

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

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

            return element;
          },

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

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

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

cumulativeOffset: function(element) {
                    var valueT = 0, valueL = 0;
                    do {
                      valueT += element.offsetTop  || 0;
                      valueL += element.offsetLeft || 0;
                      element = element.offsetParent;
                    } while (element);
                    return Element._returnOffset(valueL, valueT);
                  },

positionedOffset: function(element) {
                    var valueT = 0, 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 Element._returnOffset(valueL, valueT);
                  },

absolutize: function(element) {
              element = $(element);
              if (element.getStyle('position') == 'absolute') return;
              // Position.prepare(); // To be done manually by Scripty when it needs it.

              var offsets = element.positionedOffset();
              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';
              return element;
            },

relativize: function(element) {
              element = $(element);
              if (element.getStyle('position') == 'relative') return;
              // Position.prepare(); // To be done manually by Scripty when it needs it.

              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;
              return element;
            },

cumulativeScrollOffset: function(element) {
                          var valueT = 0, valueL = 0;
                          do {
                            valueT += element.scrollTop  || 0;
                            valueL += element.scrollLeft || 0;
                            element = element.parentNode;
                          } while (element);
                          return Element._returnOffset(valueL, valueT);
                        },

getOffsetParent: 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);
                 },

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

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

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

                  } while (element = element.offsetParent);

                  element = forElement;
                  do {
                    if (!Prototype.Browser.Opera || element.tagName == 'BODY') {
                      valueT -= element.scrollTop  || 0;
                      valueL -= element.scrollLeft || 0;
                    }
                  } while (element = element.parentNode);

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

clonePosition: function(element, source) {
                 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 = source.viewportOffset();

// find coordinate system to use
element = $(element);
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(element, 'position') == 'absolute') {
  parent = element.getOffsetParent();
  delta = parent.viewportOffset();
}

// 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)   element.style.left  = (p[0] - delta[0] + options.offsetLeft) + 'px';
if (options.setTop)    element.style.top   = (p[1] - delta[1] + options.offsetTop) + 'px';
if (options.setWidth)  element.style.width = source.offsetWidth + 'px';
if (options.setHeight) element.style.height = source.offsetHeight + 'px';
return element;
}
};

Element.Methods.identify.counter = 1;

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

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


if (!document.createRange || Prototype.Browser.Opera) {
  Element.Methods.insert = function(element, insertions) {
    element = $(element);

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

    var t = Element._insertionTranslations, content, position, pos, tagName;

    for (position in insertions) {
      content  = insertions[position];
      position = position.toLowerCase();
      pos      = t[position];

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

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

      if (t.tags[tagName]) {
        var fragments = Element._getContentFromAnonymousElement(tagName, content.stripScripts());
        if (position == 'top' || position == 'after') fragments.reverse();
        fragments.each(pos.insert.curry(element));
      }
      else element.insertAdjacentHTML(pos.adjacency, content.stripScripts());

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

    return element;
  };
}

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

else if (Prototype.Browser.IE) {
  $w('positionedOffset getOffsetParent viewportOffset').each(function(method) {
      Element.Methods[method] = Element.Methods[method].wrap(
        function(proceed, element) {
        element = $(element);
        var position = element.getStyle('position');
        if (position != 'static') return proceed(element);
        element.setStyle({ position: 'relative' });
        var value = proceed(element);
        element.setStyle({ position: position });
        return value;
        }
        );
      });

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

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

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

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

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

          Element._attributeTranslations = {
read: {
names: {
'class': 'className',
'for':   'htmlFor'
},
values: {
_getAttr: function(element, attribute) {
return element.getAttribute(attribute, 2);
},
_getAttrNode: function(element, attribute) {
var node = element.getAttributeNode(attribute);
return node ? node.value : "";
},
_getEv: function(element, attribute) {
var attribute = element.getAttribute(attribute);
return attribute ? attribute.toString().slice(23, -2) : null;
        },
_flag: function(element, attribute) {
         return $(element).hasAttribute(attribute) ? attribute : null;
       },
style: function(element) {
         return element.style.cssText.toLowerCase();
       },
title: function(element) {
         return element.title;
       }
}
}
};

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

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

Element._attributeTranslations.has = {};

$w('colSpan rowSpan vAlign dateTime accessKey tabIndex ' +
    'encType maxLength readOnly longDesc').each(function(attr) {
      Element._attributeTranslations.write.names[attr.toLowerCase()] = attr;
      Element._attributeTranslations.has[attr.toLowerCase()] = attr;
      });

(function(v) {
 Object.extend(v, {
href:        v._getAttr,
src:         v._getAttr,
type:        v._getAttr,
action:      v._getAttrNode,
disabled:    v._flag,
checked:     v._flag,
readonly:    v._flag,
multiple:    v._flag,
onload:      v._getEv,
onunload:    v._getEv,
onclick:     v._getEv,
ondblclick:  v._getEv,
onmousedown: v._getEv,
onmouseup:   v._getEv,
onmouseover: v._getEv,
onmousemove: v._getEv,
onmouseout:  v._getEv,
onfocus:     v._getEv,
onblur:      v._getEv,
onkeypress:  v._getEv,
onkeydown:   v._getEv,
onkeyup:     v._getEv,
onsubmit:    v._getEv,
onreset:     v._getEv,
onselect:    v._getEv,
onchange:    v._getEv
 });
})(Element._attributeTranslations.read.values);
}

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

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

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

    return element;
  };

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

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

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

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

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

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

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

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

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

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

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

    if (Element._insertionTranslations.tags[tagName]) {
      var nextSibling = element.next();
      var fragments = Element._getContentFromAnonymousElement(tagName, content.stripScripts());
      parent.removeChild(element);
      if (nextSibling)
        fragments.each(function(node) { parent.insertBefore(node, nextSibling) });
      else
        fragments.each(function(node) { parent.appendChild(node) });
    }
    else element.outerHTML = content.stripScripts();

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

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

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

Element._insertionTranslations = {
before: {
adjacency: 'beforeBegin',
           insert: function(element, node) {
             element.parentNode.insertBefore(node, element);
           },
initializeRange: function(element, range) {
                   range.setStartBefore(element);
                 }
        },
top: {
adjacency: 'afterBegin',
           insert: function(element, node) {
             element.insertBefore(node, element.firstChild);
           },
initializeRange: function(element, range) {
                   range.selectNodeContents(element);
                   range.collapse(true);
                 }
     },
bottom: {
adjacency: 'beforeEnd',
           insert: function(element, node) {
             element.appendChild(node);
           }
        },
after: {
adjacency: 'afterEnd',
           insert: function(element, node) {
             element.parentNode.insertBefore(node, element.nextSibling);
           },
initializeRange: function(element, range) {
                   range.setStartAfter(element);
                 }
       },
tags: {
TABLE:  ['<table>',                '</table>',                   1],
        TBODY:  ['<table><tbody>',         '</tbody></table>',           2],
        TR:     ['<table><tbody><tr>',     '</tr></tbody></table>',      3],
        TD:     ['<table><tbody><tr><td>', '</td></tr></tbody></table>', 4],
        SELECT: ['<select>',               '</select>',                  1]
      }
};

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

Element.Methods.Simulated = {
hasAttribute: function(element, attribute) {
                attribute = Element._attributeTranslations.has[attribute] || attribute;
                var node = $(element).getAttributeNode(attribute);
                return node && node.specified;
              }
};

Element.Methods.ByTag = { };

Object.extend(Element, Element.Methods);

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

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

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

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

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

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

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

        element._extendedByPrototype = Prototype.emptyFunction;
        return element;

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

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

Element.hasAttribute = function(element, attribute) {
  if (element.hasAttribute) return element.hasAttribute(attribute);
  return Element.Methods.Simulated.hasAttribute(element, attribute);
};

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

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

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

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

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

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

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

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

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

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

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

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

document.viewport = {
getDimensions: function() {
                 var dimensions = { };
                 $w('width height').each(function(d) {
                     var D = d.capitalize();
                     dimensions[d] = self['inner' + D] ||
                     (document.documentElement['client' + D] || document.body['client' + D]);
                     });
                 return dimensions;
               },

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

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

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

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

compileMatcher: function() {
// Selectors with namespaced attributes can't use the XPath version
if (Prototype.BrowserFeatures.XPath && !(/(\[[\w-]*?:|:checked)/).test(this.expression))
return this.compileXPathMatcher();

var e = this.expression, ps = Selector.patterns, h = Selector.handlers,
c = Selector.criteria, le, p, m;

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

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

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

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

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

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

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

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

findElements: function(root) {
                root = root || document;
                if (this.xpath) return document._getElementsByXPath(this.xpath, root);
                return this.matcher(root);
              },

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

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

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

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

         return match;
       },

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

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

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

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

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

criteria: {
tagName:      'n = h.tagName(n, r, "#{1}", c);   c = false;',
              className:    'n = h.className(n, r, "#{1}", c); c = false;',
              id:           'n = h.id(n, r, "#{1}", c);        c = false;',
              attrPresence: 'n = h.attrPresence(n, r, "#{1}"); c = 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:         /\[((?:[\w-]*:)?[\w-]+)\s*(?:([!^$*~|]?=)\s*((['"])([^\4]*?)\4|([^'"][^\]]*?)))?\]/
          },

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

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

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

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

attr: function(element, matches) {
        var nodeValue = Element.readAttribute(element, matches[1]);
        return Selector.operators[matches[2]](nodeValue, matches[3]);
      }
            },

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

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

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

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

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

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

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

            // handles nth(-last)-child, nth(-last)-of-type, and (first|last)-of-type
nth: function(nodes, formula, root, reverse, ofType) {
       if (nodes.length == 0) return [];
       if (formula == 'even') formula = '2n+0';
       if (formula == 'odd')  formula = '2n+1';
       var h = Selector.handlers, results = [], indexed = [], m;
       h.mark(nodes);
       for (var i = 0, node; node = nodes[i]; i++) {
         if (!node.parentNode._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, selectorType, 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(), 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 (Object.isNumber(expression)) {
                 index = expression; expression = false;
               }
               return Selector.matchElements(elements, expression || '*')[index || 0];
             },

findChildElements: function(element, expressions) {
                     var exprs = expressions.join(','), expressions = [];
                     exprs.scan(/(([\w#:.~>+()\s-]+|\*|\[.*?\])+)\s*(,|$)/, function(m) {
                         expressions.push(m[1].strip());
                         });
                     var results = [], h = Selector.handlers;
                     for (var i = 0, l = expressions.length, selector; i < l; i++) {
                       selector = new Selector(expressions[i].strip());
                       h.concat(results, selector.findElements(element));
                     }
                     return (l > 1) ? h.unique(results) : results;
                   }
});

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

serializeElements: function(elements, options) {
                     if (typeof options != 'object') options = { hash: !!options };
                     else if (options.hash === undefined) options.hash = true;
                     var key, value, submitted = false, submit = options.submit;

                     var data = elements.inject({ }, function(result, element) {
                         if (!element.disabled && element.name) {
                         key = element.name; value = $(element).getValue();
                         if (value != null && (element.type != 'submit' || (!submitted &&
                               submit !== false && (!submit || key == submit) && (submitted = true)))) {
                         if (key in result) {
                         // a key is already present; construct an array of values
                         if (!Object.isArray(result[key])) result[key] = [result[key]];
                         result[key].push(value);
                         }
                         else result[key] = value;
                         }
                         }
                         return result;
                         });

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

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

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

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

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

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

             return matchingInputs;
           },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

activate: function(element) {
            element = $(element);
            try {
              element.focus();
              if (element.select && (element.tagName.toLowerCase() != 'input' ||
                    !['button', 'reset', 'submit'].include(element.type)))
                element.select();
            } catch (e) { }
            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, value) {
         switch (element.type.toLowerCase()) {
           case 'checkbox':
           case 'radio':
             return Form.Element.Serializers.inputSelector(element, value);
           default:
             return Form.Element.Serializers.textarea(element, value);
         }
       },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

cache: { },

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

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

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

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

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

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

                 element: function(event) {
                   var node = Event.extend(event).target;
                   return Element.extend(node.nodeType == Node.TEXT_NODE ? node.parentNode : node);
                 },

findElement: function(event, expression) {
               var element = Event.element(event);
               return element.match(expression) ? element : element.up(expression);
             },

pointer: function(event) {
           return {
x: event.pageX || (event.clientX +
       (document.documentElement.scrollLeft || document.body.scrollLeft)),
   y: event.pageY || (event.clientY +
       (document.documentElement.scrollTop || document.body.scrollTop))
           };
         },

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

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

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

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

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

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

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

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

      function getEventID(element) {
      if (element._eventID) return element._eventID;
      arguments.callee.id = arguments.callee.id || 1;
      return element._eventID = ++arguments.callee.id;
      }

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

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

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

      function createWrapper(element, eventName, handler) {
        var id = getEventID(element);
        var c = getWrappersForEventName(id, eventName);
        if (c.pluck("handler").include(handler)) return false;

        var wrapper = function(event) {
          if (!Event || !Event.extend ||
              (event.eventName && event.eventName != eventName))
            return false;

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

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

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

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

      function destroyCache() {
        for (var id in cache)
          for (var eventName in cache[id])
            cache[id][eventName] = null;
      }

      if (window.attachEvent) {
        window.attachEvent("onunload", destroyCache);
      }

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

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

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

           return element;
         },

stopObserving: function(element, eventName, handler) {
                 element = $(element);
                 var id = getEventID(element), name = getDOMEventName(eventName);

                 if (!handler && eventName) {
                   getWrappersForEventName(id, eventName).each(function(wrapper) {
                       element.stopObserving(eventName, wrapper.handler);
                       });
                   return element;

                 } else if (!eventName) {
                   Object.keys(getCacheForID(id)).each(function(eventName) {
                       element.stopObserving(eventName);
                       });
                   return element;
                 }

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

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

                 destroyWrapper(id, eventName, handler);

                 return element;
               },

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

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

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

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

        return event;
      }
      };
})());

Object.extend(Event, Event.Methods);

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

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

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

 var timer, fired = false;

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

 if (document.addEventListener) {
 if (Prototype.Browser.WebKit) {
 timer = window.setInterval(function() {
   if (/loaded|complete/.test(document.readyState))
   fireContentLoadedEvent();
   }, 0);

 Event.observe(window, "load", fireContentLoadedEvent);

 } else {
   document.addEventListener("DOMContentLoaded",
       fireContentLoadedEvent, false);
 }

 } else {
   document.write("<script id=__onDOMContentLoaded defer src=//:><\/script>");
   $("__onDOMContentLoaded").onreadystatechange = function() {
     if (this.readyState == "complete") {
       this.onreadystatechange = null;
       fireContentLoadedEvent();
     }
   };
 }
})();
/*------------------------------- DEPRECATED -------------------------------*/

Hash.toQueryString = Object.toQueryString;

var Toggle = { display: Element.toggle };

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

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

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

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

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

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

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

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

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

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

                                return (this.ycomp >= this.offset[1] &&
                                    this.ycomp <  this.offset[1] + 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;
         },

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

cumulativeOffset: Element.Methods.cumulativeOffset,

                  positionedOffset: Element.Methods.positionedOffset,

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

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

realOffset: Element.Methods.cumulativeScrollOffset,

            offsetParent: Element.Methods.getOffsetParent,

            page: Element.Methods.viewportOffset,

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Element.addMethods();