/*
Copyright (c) 2006, Yahoo! Inc. All rights reserved.
Code licensed under the BSD License:
http://developer.yahoo.net/yui/license.txt
Version: 0.11.4
*/

/**
 * The YAHOO object is the single global object used by YUI Library.  It
 * contains utility function for setting up namespaces, inheritance, and
 * logging.  YAHOO.util, YAHOO.widget, and YAHOO.example are namespaces
 * created automatically for and used by the library.
 * @module YAHOO
 */

/**
 * The YAHOO global namespace object
 * @class YAHOO
 * @static
 */
if (typeof YAHOO == "undefined") {
    YAHOO = {};
}

/**
 * Returns the namespace specified and creates it if it doesn't exist
 *
 * YAHOO.namespace("property.package");
 * YAHOO.namespace("YAHOO.property.package");
 *
 * Either of the above would create YAHOO.property, then
 * YAHOO.property.package
 *
 * Be careful when naming packages. Reserved words may work in some browsers
 * and not others. For instance, the following will fail in Safari:
 *
 * YAHOO.namespace("really.long.nested.namespace");
 *
 * This fails because "long" is a future reserved word in ECMAScript
 * @method namespace
 * @static
 * @param  {String} ns The name of the namespace
 * @return {Object}    A reference to the namespace object
 */
YAHOO.namespace = function(ns) {

    if (!ns || !ns.length) {
        return null;
    }

    var levels = ns.split(".");
    var nsobj = YAHOO;

    // YAHOO is implied, so it is ignored if it is included
    for (var i=(levels[0] == "YAHOO") ? 1 : 0; i<levels.length; ++i) {
        nsobj[levels[i]] = nsobj[levels[i]] || {};
        nsobj = nsobj[levels[i]];
    }

    return nsobj;
};

/**
 * Uses YAHOO.widget.Logger to output a log message, if the widget is available.
 *
 * @method log
 * @static
 * @param  {string}  sMsg       The message to log.
 * @param  {string}  sCategory  The log category for the message.  Default
 *                              categories are "info", "warn", "error", time".
 *                              Custom categories can be used as well. (opt)
 * @param  {string}  sSource    The source of the the message (opt)
 * @return {boolean}            True if the log operation was successful.
 */
YAHOO.log = function(sMsg, sCategory, sSource) {
    var l = YAHOO.widget.Logger;
    if(l && l.log) {
        return l.log(sMsg, sCategory, sSource);
    } else {
        return false;
    }
};

/**
 * Utility to set up the prototype, constructor and superclass properties to
 * support an inheritance strategy that can chain constructors and methods.
 *
 * @method extend
 * @static
 * @param {function} subclass   the object to modify
 * @param {function} superclass the object to inherit
 */
YAHOO.extend = function(subclass, superclass) {
    var f = function() {};
    f.prototype = superclass.prototype;
    subclass.prototype = new f();
    subclass.prototype.constructor = subclass;
    subclass.superclass = superclass.prototype;
    if (superclass.prototype.constructor == Object.prototype.constructor) {
        superclass.prototype.constructor = superclass;
    }
};

YAHOO.namespace("util");
YAHOO.namespace("widget");
YAHOO.namespace("example");

/*
Copyright (c) 2006, Yahoo! Inc. All rights reserved.
Code licensed under the BSD License:
http://developer.yahoo.net/yui/license.txt
Version: 0.11.4
*/

/**
 * The CustomEvent class lets you define events for your application
 * that can be subscribed to by one or more independent component.
 *
 * @param {String}  type The type of event, which is passed to the callback
 *                  when the event fires
 * @param {Object}  oScope The context the event will fire from.  "this" will
 *                  refer to this object in the callback.  Default value:
 *                  the window object.  The listener can override this.
 * @param {boolean} silent pass true to prevent the event from writing to
 *                  the log system
 * @namespace YAHOO.util
 * @class CustomEvent
 * @constructor
 */
YAHOO.util.CustomEvent = function(type, oScope, silent) {

    /**
     * The type of event, returned to subscribers when the event fires
     * @property type
     * @type string
     */
    this.type = type;

    /**
     * The scope the the event will fire from by default.  Defaults to the window
     * obj
     * @property scope
     * @type object
     */
    this.scope = oScope || window;

    /**
     * By default all custom events are logged in the debug build, set silent
     * to true to disable logging for this event.
     * @property silent
     * @type boolean
     */
    this.silent = silent;

    /**
     * The subscribers to this event
     * @property subscribers
     * @type Subscriber[]
     */
    this.subscribers = [];

    if (!this.silent) {
    }

    // Only add subscribe events for events that are not generated by CustomEvent
    //if (oScope && (oScope.constructor != this.constructor)) {

        /*
         * Custom events provide a custom event that fires whenever there is
         * a new subscriber to the event.  This provides an opportunity to
         * handle the case where there is a non-repeating event that has
         * already fired has a new subscriber.
         *
         * type CustomEvent
         */
        //this.subscribeEvent =
                //new YAHOO.util.CustomEvent("subscribe", this, true);

    //}
};

YAHOO.util.CustomEvent.prototype = {
    /**
     * Subscribes the caller to this event
     * @method subscribe
     * @param {Function} fn       The function to execute
     * @param {Object}   obj      An object to be passed along when the event fires
     * @param {boolean}  bOverride If true, the obj passed in becomes the execution
     *                            scope of the listener
     */
    subscribe: function(fn, obj, bOverride) {
        //if (this.subscribeEvent) {
            //this.subscribeEvent.fire(fn, obj, bOverride);
        //}

        this.subscribers.push( new YAHOO.util.Subscriber(fn, obj, bOverride) );
    },

    /**
     * Unsubscribes the caller from this event
     * @method unsubscribe
     * @param {Function} fn  The function to execute
     * @param {Object}   obj An object to be passed along when the event fires
     * @return {boolean} True if the subscriber was found and detached.
     */
    unsubscribe: function(fn, obj) {
        var found = false;
        for (var i=0, len=this.subscribers.length; i<len; ++i) {
            var s = this.subscribers[i];
            if (s && s.contains(fn, obj)) {
                this._delete(i);
                found = true;
            }
        }

        return found;
    },

    /**
     * Notifies the subscribers.  The callback functions will be executed
     * from the scope specified when the event was created, and with the following
     * parameters:
     *   <pre>
     *   - The type of event
     *   - All of the arguments fire() was executed with as an array
     *   - The custom object (if any) that was passed into the subscribe() method
     *   </pre>
     * @method fire
     * @param {Array} an arbitrary set of parameters to pass to the handler
     */
    fire: function() {
        var len=this.subscribers.length;
        if (!len && this.silent) {
            return;
        }

        var args = [];

        for (var i=0; i<arguments.length; ++i) {
            args.push(arguments[i]);
        }

        if (!this.silent) {
        }

        for (i=0; i<len; ++i) {
            var s = this.subscribers[i];
            if (s) {
                if (!this.silent) {
                }
                var scope = (s.override) ? s.obj : this.scope;
                s.fn.call(scope, this.type, args, s.obj);
            }
        }
    },

    /**
     * Removes all listeners
     * @method unsubscribeAll
     */
    unsubscribeAll: function() {
        for (var i=0, len=this.subscribers.length; i<len; ++i) {
            this._delete(len - 1 - i);
        }
    },

    /**
     * @method _delete
     * @private
     */
    _delete: function(index) {
        var s = this.subscribers[index];
        if (s) {
            delete s.fn;
            delete s.obj;
        }

        // delete this.subscribers[index];
        this.subscribers.splice(index, 1);
    },

    /**
     * @method toString
     */
    toString: function() {
         return "CustomEvent: " + "'" + this.type  + "', " +
             "scope: " + this.scope;

    }
};

/////////////////////////////////////////////////////////////////////

/**
 * Stores the subscriber information to be used when the event fires.
 * @param {Function} fn       The function to execute
 * @param {Object}   obj      An object to be passed along when the event fires
 * @param {boolean}  bOverride If true, the obj passed in becomes the execution
 *                            scope of the listener
 * @class Subscriber
 * @constructor
 */
YAHOO.util.Subscriber = function(fn, obj, bOverride) {

    /**
     * The callback that will be execute when the event fires
     * @property fn
     * @type function
     */
    this.fn = fn;

    /**
     * An optional custom object that will passed to the callback when
     * the event fires
     * @property obj
     * @type object
     */
    this.obj = obj || null;

    /**
     * The default execution scope for the event listener is defined when the
     * event is created (usually the object which contains the event).
     * By setting override to true, the execution scope becomes the custom
     * object passed in by the subscriber
     * @property override
     * @type boolean
     */
    this.override = (bOverride);
};

/**
 * Returns true if the fn and obj match this objects properties.
 * Used by the unsubscribe method to match the right subscriber.
 *
 * @method contains
 * @param {Function} fn the function to execute
 * @param {Object} obj an object to be passed along when the event fires
 * @return {boolean} true if the supplied arguments match this
 *                   subscriber's signature.
 */
YAHOO.util.Subscriber.prototype.contains = function(fn, obj) {
    return (this.fn == fn && this.obj == obj);
};

/**
 * @method toString
 */
YAHOO.util.Subscriber.prototype.toString = function() {
    return "Subscriber { obj: " + (this.obj || "")  +
           ", override: " +  (this.override || "no") + " }";
};

// The first instance of Event will win if it is loaded more than once.
if (!YAHOO.util.Event) {

/**
 * The event utility provides functions to add and remove event listeners,
 * event cleansing.  It also tries to automatically remove listeners it
 * registers during the unload event.
 * @namespace YAHOO.util
 * @class Event
 */
    YAHOO.util.Event = function() {

        /**
         * True after the onload event has fired
         * @property loadComplete
         * @type boolean
         * @private
         */
        var loadComplete =  false;

        /**
         * Cache of wrapped listeners
         * @property listeners
         * @type array
         * @private
         */
        var listeners = [];

        /**
         * Listeners that will be attached during the onload event
         * @property delayedListeners
         * @type array
         * @private
         */
        var delayedListeners = [];

        /**
         * User-defined unload function that will be fired before all events
         * are detached
         * @property unloadListeners
         * @type array
         * @private
         */
        var unloadListeners = [];

        /**
         * Cache of DOM0 event handlers to work around issues with DOM2 events
         * in Safari
         * @property legacyEvents
         * @private
         */
        var legacyEvents = [];

        /**
         * Listener stack for DOM0 events
         * @property legacyHandlers
         * @private
         */
        var legacyHandlers = [];

        /**
         * The number of times to poll after window.onload.  This number is
         * increased if additional late-bound handlers are requested after
         * the page load.
         * @property retryCount
         * @private
         */
        var retryCount = 0;

        /**
         * onAvailable listeners
         * @property onAvailStack
         * @private
         */
        var onAvailStack = [];

        /**
         * Lookup table for legacy events
         * @property legacyMap
         * @private
         */
        var legacyMap = [];

        /**
         * Counter for auto id generation
         * @property counter
         * @private
         */
        var counter = 0;

        return { // PREPROCESS

            /**
             * The number of times we should look for elements that are not
             * in the DOM at the time the event is requested after the document
             * has been loaded.  The default is 200@amp;50 ms, so it will poll
             * for 10 seconds or until all outstanding handlers are bound
             * (whichever comes first).
             * @property POLL_RETRYS
             * @type int
             */
            POLL_RETRYS: 200,

            /**
             * The poll interval in milliseconds
             * @property POLL_INTERVAL
             * @type int
             */
            POLL_INTERVAL: 50,

            /**
             * Element to bind, int constant
             * @property EL
             * @type int
             */
            EL: 0,

            /**
             * Type of event, int constant
             * @property TYPE
             * @type int
             */
            TYPE: 1,

            /**
             * Function to execute, int constant
             * @property FN
             * @type int
             */
            FN: 2,

            /**
             * Function wrapped for scope correction and cleanup, int constant
             * @property WFN
             * @type int
             */
            WFN: 3,

            /**
             * Object passed in by the user that will be returned as a
             * parameter to the callback, int constant
             * @property SCOPE
             * @type int
             */
            SCOPE: 3,

            /**
             * Adjusted scope, either the element we are registering the event
             * on or the custom object passed in by the listener, int constant
             * @property ADJ_SCOPE
             * @type int
             */
            ADJ_SCOPE: 4,

            /**
             * Safari detection is necessary to work around the preventDefault
             * bug that makes it so you can't cancel a href click from the
             * handler.  There is not a capabilities check we can use here.
             * @property isSafari
             * @private
             */
            isSafari: (/Safari|Konqueror|KHTML/gi).test(navigator.userAgent),

            /**
             * IE detection needed to properly calculate pageX and pageY.
             * capabilities checking didn't seem to work because another
             * browser that does not provide the properties have the values
             * calculated in a different manner than IE.
             * @property isIE
             * @private
             */
            isIE: (!this.isSafari && !navigator.userAgent.match(/opera/gi) &&
                    navigator.userAgent.match(/msie/gi)),

            /**
             * @method addDelayedListener
             * @private
             */
            addDelayedListener: function(el, sType, fn, oScope, bOverride) {
                delayedListeners[delayedListeners.length] =
                    [el, sType, fn, oScope, bOverride];

                // If this happens after the inital page load, we need to
                // reset the poll counter so that we continue to search for
                // the element for a fixed period of time.
                if (loadComplete) {
                    retryCount = this.POLL_RETRYS;
                    this.startTimeout(0);
                    // this._tryPreloadAttach();
                }
            },

            /**
             * @method startTimeout
             * @private
             */
            startTimeout: function(interval) {
                var i = (interval || interval === 0) ? interval : this.POLL_INTERVAL;
                var self = this;
                var callback = function() { self._tryPreloadAttach(); };
                this.timeout = setTimeout(callback, i);
            },

            /**
             * Executes the supplied callback when the item with the supplied
             * id is found.  This is meant to be used to execute behavior as
             * soon as possible as the page loads.  If you use this after the
             * initial page load it will poll for a fixed time for the element.
             * The number of times it will poll and the frequency are
             * configurable.  By default it will poll for 10 seconds.
             *
             * @method onAvailable
             *
             * @param {string}   p_id the id of the element to look for.
             * @param {function} p_fn what to execute when the element is found.
             * @param {object}   p_obj an optional object to be passed back as
             *                   a parameter to p_fn.
             * @param {boolean}  p_override If set to true, p_fn will execute
             *                   in the scope of p_obj
             *
             */
            onAvailable: function(p_id, p_fn, p_obj, p_override) {
                onAvailStack.push( { id:       p_id,
                                     fn:       p_fn,
                                     obj:      p_obj,
                                     override: p_override } );

                retryCount = this.POLL_RETRYS;
                this.startTimeout(0);
                // this._tryPreloadAttach();
            },

            /**
             * Appends an event handler
             *
             * @method addListener
             *
             * @param {Object}   el        The html element to assign the
             *                             event to
             * @param {String}   sType     The type of event to append
             * @param {Function} fn        The method the event invokes
             * @param {Object}   oScope    An arbitrary object that will be
             *                             passed as a parameter to the handler
             * @param {boolean}  bOverride If true, the obj passed in becomes
             *                             the execution scope of the listener
             * @return {boolean} True if the action was successful or defered,
             *                        false if one or more of the elements
             *                        could not have the event bound to it.
             */
            addListener: function(el, sType, fn, oScope, bOverride) {

                if (!fn || !fn.call) {
                    return false;
                }

                // The el argument can be an array of elements or element ids.
                if ( this._isValidCollection(el)) {
                    var ok = true;
                    for (var i=0,len=el.length; i<len; ++i) {
                        ok = ( this.on(el[i],
                                       sType,
                                       fn,
                                       oScope,
                                       bOverride) && ok );
                    }
                    return ok;

                } else if (typeof el == "string") {
                    var oEl = this.getEl(el);
                    // If the el argument is a string, we assume it is
                    // actually the id of the element.  If the page is loaded
                    // we convert el to the actual element, otherwise we
                    // defer attaching the event until onload event fires

                    // check to see if we need to delay hooking up the event
                    // until after the page loads.
                    if (loadComplete && oEl) {
                        el = oEl;
                    } else {
                        // defer adding the event until onload fires
                        this.addDelayedListener(el,
                                                sType,
                                                fn,
                                                oScope,
                                                bOverride);

                        return true;
                    }
                }

                // Element should be an html element or an array if we get
                // here.
                if (!el) {
                    return false;
                }

                // we need to make sure we fire registered unload events
                // prior to automatically unhooking them.  So we hang on to
                // these instead of attaching them to the window and fire the
                // handles explicitly during our one unload event.
                if ("unload" == sType && oScope !== this) {
                    unloadListeners[unloadListeners.length] =
                            [el, sType, fn, oScope, bOverride];
                    return true;
                }

                // if the user chooses to override the scope, we use the custom
                // object passed in, otherwise the executing scope will be the
                // HTML element that the event is registered on
                var scope = (bOverride) ? oScope : el;

                // wrap the function so we can return the oScope object when
                // the event fires;
                var wrappedFn = function(e) {
                        return fn.call(scope, YAHOO.util.Event.getEvent(e),
                                oScope);
                    };

                var li = [el, sType, fn, wrappedFn, scope];
                var index = listeners.length;
                // cache the listener so we can try to automatically unload
                listeners[index] = li;

                if (this.useLegacyEvent(el, sType)) {
                    var legacyIndex = this.getLegacyIndex(el, sType);

                    // Add a new dom0 wrapper if one is not detected for this
                    // element
                    if ( legacyIndex == -1 ||
                                el != legacyEvents[legacyIndex][0] ) {

                        legacyIndex = legacyEvents.length;
                        legacyMap[el.id + sType] = legacyIndex;

                        // cache the signature for the DOM0 event, and
                        // include the existing handler for the event, if any
                        legacyEvents[legacyIndex] =
                            [el, sType, el["on" + sType]];
                        legacyHandlers[legacyIndex] = [];

                        el["on" + sType] =
                            function(e) {
                                YAHOO.util.Event.fireLegacyEvent(
                                    YAHOO.util.Event.getEvent(e), legacyIndex);
                            };
                    }

                    // add a reference to the wrapped listener to our custom
                    // stack of events
                    //legacyHandlers[legacyIndex].push(index);
                    legacyHandlers[legacyIndex].push(li);

                // DOM2 Event model
                } else if (el.addEventListener) {
                    el.addEventListener(sType, wrappedFn, false);
                // IE
                } else if (el.attachEvent) {
                    el.attachEvent("on" + sType, wrappedFn);
                }

                return true;

            },

            /**
             * When using legacy events, the handler is routed to this object
             * so we can fire our custom listener stack.
             * @method fireLegacyEvent
             * @private
             */
            fireLegacyEvent: function(e, legacyIndex) {
                var ok = true;

                var le = legacyHandlers[legacyIndex];
                for (var i=0,len=le.length; i<len; ++i) {
                    var li = le[i];
                    if ( li && li[this.WFN] ) {
                        var scope = li[this.ADJ_SCOPE];
                        var ret = li[this.WFN].call(scope, e);
                        ok = (ok && ret);
                    }
                }

                return ok;
            },

            /**
             * Returns the legacy event index that matches the supplied
             * signature
             * @method getLegacyIndex
             * @private
             */
            getLegacyIndex: function(el, sType) {
                var key = this.generateId(el) + sType;
                if (typeof legacyMap[key] == "undefined") {
                    return -1;
                } else {
                    return legacyMap[key];
                }
            },

            /**
             * Logic that determines when we should automatically use legacy
             * events instead of DOM2 events.
             * @method useLegacyEvent
             * @private
             */
            useLegacyEvent: function(el, sType) {
                if (!el.addEventListener && !el.attachEvent) {
                    return true;
                } else if (this.isSafari) {
                    if ("click" == sType || "dblclick" == sType) {
                        return true;
                    }
                }
                return false;
            },

            /**
             * Removes an event handler
             *
             * @method removeListener
             *
             * @param {Object} el the html element or the id of the element to
             * assign the event to.
             * @param {String} sType the type of event to remove
             * @param {Function} fn the method the event invokes
             * @return {boolean} true if the unbind was successful, false
             * otherwise
             */
            removeListener: function(el, sType, fn, index) {

                if (!fn || !fn.call) {
                    return false;
                }

                var i, len;

                // The el argument can be a string
                if (typeof el == "string") {
                    el = this.getEl(el);
                // The el argument can be an array of elements or element ids.
                } else if ( this._isValidCollection(el)) {
                    var ok = true;
                    for (i=0,len=el.length; i<len; ++i) {
                        ok = ( this.removeListener(el[i], sType, fn) && ok );
                    }
                    return ok;
                }

                if ("unload" == sType) {

                    for (i=0, len=unloadListeners.length; i<len; i++) {
                        var li = unloadListeners[i];
                        if (li &&
                            li[0] == el &&
                            li[1] == sType &&
                            li[2] == fn) {
                                unloadListeners.splice(i, 1);
                                return true;
                        }
                    }

                    return false;
                }

                var cacheItem = null;

                //var index = arguments[3];

                if ("undefined" == typeof index) {
                    index = this._getCacheIndex(el, sType, fn);
                }

                if (index >= 0) {
                    cacheItem = listeners[index];
                }

                if (!el || !cacheItem) {
                    return false;
                }

                if (this.useLegacyEvent(el, sType)) {
                    var legacyIndex = this.getLegacyIndex(el, sType);
                    var llist = legacyHandlers[legacyIndex];
                    if (llist) {
                        for (i=0, len=llist.length; i<len; ++i) {
                            li = llist[i];
                            if (li &&
                                li[this.EL] == el &&
                                li[this.TYPE] == sType &&
                                li[this.FN] == fn) {
                                    llist.splice(i, 1);
                            }
                        }
                    }

                } else if (el.removeEventListener) {
                    el.removeEventListener(sType, cacheItem[this.WFN], false);
                } else if (el.detachEvent) {
                    el.detachEvent("on" + sType, cacheItem[this.WFN]);
                }

                // removed the wrapped handler
                delete listeners[index][this.WFN];
                delete listeners[index][this.FN];
                listeners.splice(index, 1);

                return true;

            },

            /**
             * Returns the event's target element
             * @method getTarget
             * @param {Event} ev the event
             * @param {boolean} resolveTextNode when set to true the target's
             *                  parent will be returned if the target is a
             *                  text node.  @deprecated, the text node is
             *                  now resolved automatically
             * @return {HTMLElement} the event's target
             */
            getTarget: function(ev, resolveTextNode) {
                var t = ev.target || ev.srcElement;
                return this.resolveTextNode(t);
            },

            /**
             * In some cases, some browsers will return a text node inside
             * the actual element that was targeted.  This normalizes the
             * return value for getTarget and getRelatedTarget.
             * @method resolveTextNode
             * @param {HTMLElement} node to resolve
             * @return  the normized node
             */
            resolveTextNode: function(node) {
                if (node && node.nodeName &&
                        "#TEXT" == node.nodeName.toUpperCase()) {
                    return node.parentNode;
                } else {
                    return node;
                }
            },

            /**
             * Returns the event's pageX
             * @method getPageX
             * @param {Event} ev the event
             * @return {int} the event's pageX
             */
            getPageX: function(ev) {
                var x = ev.pageX;
                if (!x && 0 !== x) {
                    x = ev.clientX || 0;

                    if ( this.isIE ) {
                        x += this._getScrollLeft();
                    }
                }

                return x;
            },

            /**
             * Returns the event's pageY
             * @method getPageY
             * @param {Event} ev the event
             * @return {int} the event's pageY
             */
            getPageY: function(ev) {
                var y = ev.pageY;
                if (!y && 0 !== y) {
                    y = ev.clientY || 0;

                    if ( this.isIE ) {
                        y += this._getScrollTop();
                    }
                }

                return y;
            },

            /**
             * Returns the pageX and pageY properties as an indexed array.
             * @method getXY
             * @type int[]
             */
            getXY: function(ev) {
                return [this.getPageX(ev), this.getPageY(ev)];
            },

            /**
             * Returns the event's related target
             * @method getRelatedTarget
             * @param {Event} ev the event
             * @return {HTMLElement} the event's relatedTarget
             */
            getRelatedTarget: function(ev) {
                var t = ev.relatedTarget;
                if (!t) {
                    if (ev.type == "mouseout") {
                        t = ev.toElement;
                    } else if (ev.type == "mouseover") {
                        t = ev.fromElement;
                    }
                }

                return this.resolveTextNode(t);
            },

            /**
             * Returns the time of the event.  If the time is not included, the
             * event is modified using the current time.
             * @method getTime
             * @param {Event} ev the event
             * @return {Date} the time of the event
             */
            getTime: function(ev) {
                if (!ev.time) {
                    var t = new Date().getTime();
                    try {
                        ev.time = t;
                    } catch(e) {
                        // can't set the time property
                        return t;
                    }
                }

                return ev.time;
            },

            /**
             * Convenience method for stopPropagation + preventDefault
             * @method stopEvent
             * @param {Event} ev the event
             */
            stopEvent: function(ev) {
                this.stopPropagation(ev);
                this.preventDefault(ev);
            },

            /**
             * Stops event propagation
             * @method stopPropagation
             * @param {Event} ev the event
             */
            stopPropagation: function(ev) {
                if (ev.stopPropagation) {
                    ev.stopPropagation();
                } else {
                    ev.cancelBubble = true;
                }
            },

            /**
             * Prevents the default behavior of the event
             * @method preventDefault
             * @param {Event} ev the event
             */
            preventDefault: function(ev) {
                if (ev.preventDefault) {
                    ev.preventDefault();
                } else {
                    ev.returnValue = false;
                }
            },

            /**
             * Finds the event in the window object, the caller's arguments, or
             * in the arguments of another method in the callstack.  This is
             * executed automatically for events registered through the event
             * manager, so the implementer should not normally need to execute
             * this function at all.
             * @method getEvent
             * @param {Event} the event parameter from the handler
             * @return {Event} the event
             */
            getEvent: function(e) {
                var ev = e || window.event;

                if (!ev) {
                    var c = this.getEvent.caller;
                    while (c) {
                        ev = c.arguments[0];
                        if (ev && Event == ev.constructor) {
                            break;
                        }
                        c = c.caller;
                    }
                }

                return ev;
            },

            /**
             * Returns the charcode for an event
             * @method getCharCode
             * @param {Event} ev the event
             * @return {int} the event's charCode
             */
            getCharCode: function(ev) {
                return ev.charCode || ((ev.type == "keypress") ? ev.keyCode : 0);
            },

            /**
             * Locating the saved event handler data by function ref
             *
             * @method _getCacheIndex
             * @private
             */
            _getCacheIndex: function(el, sType, fn) {
                for (var i=0,len=listeners.length; i<len; ++i) {
                    var li = listeners[i];
                    if ( li                 &&
                         li[this.FN] == fn  &&
                         li[this.EL] == el  &&
                         li[this.TYPE] == sType ) {
                        return i;
                    }
                }

                return -1;
            },

            /**
             * Generates an unique ID for the element if it does not already
             * have one.
             * @method generateId
             * @param el the element
             * @return {string} the id of the element
             */
            generateId: function(el) {
                var id = el.id;

                if (!id) {
                    id = "yuievtautoid-" + counter;
                    ++counter;
                    el.id = id;
                }

                return id;
            },

            /**
             * We want to be able to use getElementsByTagName as a collection
             * to attach a group of events to.  Unfortunately, different
             * browsers return different types of collections.  This function
             * tests to determine if the object is array-like.  It will also
             * fail if the object is an array, but is empty.
             * @method _isValidCollection
             * @param o the object to test
             * @return {boolean} true if the object is array-like and populated
             * @private
             */
            _isValidCollection: function(o) {

                return ( o                    && // o is something
                         o.length             && // o is indexed
                         typeof o != "string" && // o is not a string
                         !o.tagName           && // o is not an HTML element
                         !o.alert             && // o is not a window
                         typeof o[0] != "undefined" );

            },

            /**
             * @private
             * @property elCache
             * DOM element cache
             */
            elCache: {},

            /**
             * We cache elements bound by id because when the unload event
             * fires, we can no longer use document.getElementById
             * @method getEl
             * @private
             */
            getEl: function(id) {
                return document.getElementById(id);
            },

            /**
             * Clears the element cache
             * @deprecated
             * @private
             */
            clearCache: function() { },

            /**
             * hook up any deferred listeners
             * @method _load
             * @private
             */
            _load: function(e) {
                loadComplete = true;
                var EU = YAHOO.util.Event;
                EU._simpleRemove(window, "load", EU._load);
            },

            /**
             * Polling function that runs before the onload event fires,
             * attempting to attach to DOM Nodes as soon as they are
             * available
             * @method _tryPreloadAttach
             * @private
             */
            _tryPreloadAttach: function() {

                if (this.locked) {
                    return false;
                }

                this.locked = true;

                // keep trying until after the page is loaded.  We need to
                // check the page load state prior to trying to bind the
                // elements so that we can be certain all elements have been
                // tested appropriately
                var tryAgain = !loadComplete;
                if (!tryAgain) {
                    tryAgain = (retryCount > 0);
                }

                // Delayed listeners
                var stillDelayed = [];

                for (var i=0,len=delayedListeners.length; i<len; ++i) {
                    var d = delayedListeners[i];
                    // There may be a race condition here, so we need to
                    // verify the array element is usable.
                    if (d) {

                        // el will be null if document.getElementById did not
                        // work
                        var el = this.getEl(d[this.EL]);

                        if (el) {
                            this.on(el, d[this.TYPE], d[this.FN],
                                    d[this.SCOPE], d[this.ADJ_SCOPE]);
                            delete delayedListeners[i];
                        } else {
                            stillDelayed.push(d);
                        }
                    }
                }

                delayedListeners = stillDelayed;

                // onAvailable
                var notAvail = [];
                for (i=0,len=onAvailStack.length; i<len ; ++i) {
                    var item = onAvailStack[i];
                    if (item) {
                        el = this.getEl(item.id);

                        if (el) {
                            var scope = (item.override) ? item.obj : el;
                            item.fn.call(scope, item.obj);
                            delete onAvailStack[i];
                        } else {
                            notAvail.push(item);
                        }
                    }
                }

                retryCount = (stillDelayed.length === 0 &&
                                    notAvail.length === 0) ? 0 : retryCount - 1;

                if (tryAgain) {
                    this.startTimeout();
                }

                this.locked = false;

                return true;

            },

            /**
             * Removes all listeners attached to the given element via addListener.
             * Optionally, the node's children can also be purged.
             * Optionally, you can specify a specific type of event to remove.
             * @method purgeElement
             * @param {HTMLElement} el the element to purge
             * @param {boolean} recurse recursively purge this element's children
             * as well.  Use with caution.
             * @param {string} sType optional type of listener to purge. If
             * left out, all listeners will be removed
             */
            purgeElement: function(el, recurse, sType) {
                var elListeners = this.getListeners(el, sType);
                if (elListeners) {
                    for (var i=0,len=elListeners.length; i<len ; ++i) {
                        var l = elListeners[i];
                        // can't use the index on the changing collection
                        //this.removeListener(el, l.type, l.fn, l.index);
                        this.removeListener(el, l.type, l.fn);
                    }
                }

                if (recurse && el && el.childNodes) {
                    for (i=0,len=el.childNodes.length; i<len ; ++i) {
                        this.purgeElement(el.childNodes[i], recurse, sType);
                    }
                }
            },

            /**
             * Returns all listeners attached to the given element via addListener.
             * Optionally, you can specify a specific type of event to return.
             * @method getListeners
             * @param el {HTMLElement} the element to inspect
             * @param sType {string} optional type of listener to return. If
             * left out, all listeners will be returned
             * @return {Object} the listener. Contains the following fields:
             *    type:   (string)   the type of event
             *    fn:     (function) the callback supplied to addListener
             *    obj:    (object)   the custom object supplied to addListener
             *    adjust: (boolean)  whether or not to adjust the default scope
             *    index:  (int)      its position in the Event util listener cache
             */
            getListeners: function(el, sType) {
                var elListeners = [];
                if (listeners && listeners.length > 0) {
                    for (var i=0,len=listeners.length; i<len ; ++i) {
                        var l = listeners[i];
                        if ( l  && l[this.EL] === el &&
                                (!sType || sType === l[this.TYPE]) ) {
                            elListeners.push({
                                type:   l[this.TYPE],
                                fn:     l[this.FN],
                                obj:    l[this.SCOPE],
                                adjust: l[this.ADJ_SCOPE],
                                index:  i
                            });
                        }
                    }
                }

                return (elListeners.length) ? elListeners : null;
            },

            /**
             * Removes all listeners registered by pe.event.  Called
             * automatically during the unload event.
             * @method _unload
             * @private
             */
            _unload: function(e) {

                var EU = YAHOO.util.Event;

                for (var i=0,len=unloadListeners.length; i<len; ++i) {
                    var l = unloadListeners[i];
                    if (l) {
                        var scope = (l[EU.ADJ_SCOPE]) ? l[EU.SCOPE]: window;
                        l[EU.FN].call(scope, EU.getEvent(e), l[EU.SCOPE] );
                        delete unloadListeners[i];
                        l=null;
                    }
                }

                if (listeners && listeners.length > 0) {
                    //for (i=0,len=listeners.length; i<len ; ++i) {
                    var j = listeners.length;
                    while (j) {
                        var index = j-1;
                        l = listeners[index];
                        if (l) {
                            EU.removeListener(l[EU.EL], l[EU.TYPE],
                                    l[EU.FN], index);
                        }

                        l=null;

                        j = j - 1;
                    }

                    EU.clearCache();
                }

                for (i=0,len=legacyEvents.length; i<len; ++i) {
                    // dereference the element
                    delete legacyEvents[i][0];
                    // delete the array item
                    delete legacyEvents[i];
                }

                EU._simpleRemove(window, "unload", EU._unload);

            },

            /**
             * Returns scrollLeft
             * @method _getScrollLeft
             * @private
             */
            _getScrollLeft: function() {
                return this._getScroll()[1];
            },

            /**
             * Returns scrollTop
             * @method _getScrollTop
             * @private
             */
            _getScrollTop: function() {
                return this._getScroll()[0];
            },

            /**
             * Returns the scrollTop and scrollLeft.  Used to calculate the
             * pageX and pageY in Internet Explorer
             * @method _getScroll
             * @private
             */
            _getScroll: function() {
                var dd = document.documentElement, db = document.body;
                if (dd && (dd.scrollTop || dd.scrollLeft)) {
                    return [dd.scrollTop, dd.scrollLeft];
                } else if (db) {
                    return [db.scrollTop, db.scrollLeft];
                } else {
                    return [0, 0];
                }
            },

            /**
             * Adds a DOM event directly without the caching, cleanup, scope adj, etc
             *
             * @param el the elment to bind the handler to
             * @param {string} sType the type of event handler
             * @param {function} fn the callback to invoke
             * @param {boolen} capture or bubble phase
             * @private
             */
            _simpleAdd: function (el, sType, fn, capture) {
                if (el.addEventListener) {
                    el.addEventListener(sType, fn, (capture));
                } else if (el.attachEvent) {
                    el.attachEvent("on" + sType, fn);
                }
            },

            /**
             * Basic remove listener
             *
             * @param el the elment to bind the handler to
             * @param {string} sType the type of event handler
             * @param {function} fn the callback to invoke
             * @param {boolen} capture or bubble phase
             * @private
             */
            _simpleRemove: function (el, sType, fn, capture) {
                if (el.removeEventListener) {
                    el.removeEventListener(sType, fn, (capture));
                } else if (el.detachEvent) {
                    el.detachEvent("on" + sType, fn);
                }
            }
        };

    } ();

    /**
     * YAHOO.util.Event.on is an alias for addListener
     * @method on
     * @see addListener
     */
    YAHOO.util.Event.on = YAHOO.util.Event.addListener;

    if (document && document.body) {
        YAHOO.util.Event._load();
    } else {
        YAHOO.util.Event._simpleAdd(window, "load", YAHOO.util.Event._load);
    }
    YAHOO.util.Event._simpleAdd(window, "unload", YAHOO.util.Event._unload);
    YAHOO.util.Event._tryPreloadAttach();
}

/*
Copyright (c) 2006, Yahoo! Inc. All rights reserved.
Code licensed under the BSD License:
http://developer.yahoo.net/yui/license.txt
Version: 0.11.3
*/

/**
 * @class Provides helper methods for DOM elements.
 */
YAHOO.util.Dom = function() {
   var ua = navigator.userAgent.toLowerCase();
   var isOpera = (ua.indexOf('opera') > -1);
   var isSafari = (ua.indexOf('safari') > -1);
   var isIE = (window.ActiveXObject);

   var id_counter = 0;
   var util = YAHOO.util; // internal shorthand
   var property_cache = {}; // to cache case conversion for set/getStyle

   var toCamel = function(property) {
      var convert = function(prop) {
         var test = /(-[a-z])/i.exec(prop);
         return prop.replace(RegExp.$1, RegExp.$1.substr(1).toUpperCase());
      };

      while(property.indexOf('-') > -1) {
         property = convert(property);
      }

      return property;
      //return property.replace(/-([a-z])/gi, function(m0, m1) {return m1.toUpperCase()}) // cant use function as 2nd arg yet due to safari bug
   };

   var toHyphen = function(property) {
      if (property.indexOf('-') > -1) { // assume hyphen
         return property;
      }

      var converted = '';
      for (var i = 0, len = property.length;i < len; ++i) {
         if (property.charAt(i) == property.charAt(i).toUpperCase()) {
            converted = converted + '-' + property.charAt(i).toLowerCase();
         } else {
            converted = converted + property.charAt(i);
         }
      }

      return converted;
      //return property.replace(/([a-z])([A-Z]+)/g, function(m0, m1, m2) {return (m1 + '-' + m2.toLowerCase())});
   };

   // improve performance by only looking up once
   var cacheConvertedProperties = function(property) {
      property_cache[property] = {
         camel: toCamel(property),
         hyphen: toHyphen(property)
      };
   };

   return {
      /**
       * Returns an HTMLElement reference
       * @param {String/HTMLElement/Array} el Accepts a string to use as an ID for getting a DOM reference, an actual DOM reference, or an Array of IDs and/or HTMLElements.
       * @return {HTMLElement/Array} A DOM reference to an HTML element or an array of HTMLElements.
       */
      get: function(el) {
         if (!el) { return null; } // nothing to work with

         if (typeof el != 'string' && !(el instanceof Array) ) { // assuming HTMLElement or HTMLCollection, so pass back as is
            return el;
         }

         if (typeof el == 'string') { // ID
            return document.getElementById(el);
         }
         else { // array of ID's and/or elements
            var collection = [];
            for (var i = 0, len = el.length; i < len; ++i) {
               collection[collection.length] = util.Dom.get(el[i]);
            }

            return collection;
         }

         return null; // safety, should never happen
      },

      /**
       * Normalizes currentStyle and ComputedStyle.
       * @param {String/HTMLElement/Array} el Accepts a string to use as an ID, an actual DOM reference, or an Array of IDs and/or HTMLElements.
       * @param {String} property The style property whose value is returned.
       * @return {String/Array} The current value of the style property for the element(s).
       */
      getStyle: function(el, property) {
         var f = function(el) {
            var value = null;
            var dv = document.defaultView;

            if (!property_cache[property]) {
               cacheConvertedProperties(property);
            }

            var camel = property_cache[property]['camel'];
            var hyphen = property_cache[property]['hyphen'];

            if (property == 'opacity' && el.filters) {// IE opacity
               value = 1;
               try {
                  value = el.filters.item('DXImageTransform.Microsoft.Alpha').opacity / 100;
               } catch(e) {
                  try {
                     value = el.filters.item('alpha').opacity / 100;
                  } catch(e) {}
               }
            } else if (el.style[camel]) { // camelCase for valid styles
               value = el.style[camel];
            }
            else if (isIE && el.currentStyle && el.currentStyle[camel]) { // camelCase for currentStyle; isIE to workaround broken Opera 9 currentStyle
               value = el.currentStyle[camel];
            }
            else if ( dv && dv.getComputedStyle ) { // hyphen-case for computedStyle
               var computed = dv.getComputedStyle(el, '');

               if (computed && computed.getPropertyValue(hyphen)) {
                  value = computed.getPropertyValue(hyphen);
               }
            }

            return value;
         };

         return util.Dom.batch(el, f, util.Dom, true);
      },

      /**
       * Wrapper for setting style properties of HTMLElements.  Normalizes "opacity" across modern browsers.
       * @param {String/HTMLElement/Array} el Accepts a string to use as an ID, an actual DOM reference, or an Array of IDs and/or HTMLElements.
       * @param {String} property The style property to be set.
       * @param {String} val The value to apply to the given property.
       */
      setStyle: function(el, property, val) {
         if (!property_cache[property]) {
            cacheConvertedProperties(property);
         }

         var camel = property_cache[property]['camel'];

         var f = function(el) {
            switch(property) {
               case 'opacity' :
                  if (isIE && typeof el.style.filter == 'string') { // in case not appended
                     el.style.filter = 'alpha(opacity=' + val * 100 + ')';

                     if (!el.currentStyle || !el.currentStyle.hasLayout) {
                        el.style.zoom = 1; // when no layout or cant tell
                     }
                  } else {
                     el.style.opacity = val;
                     el.style['-moz-opacity'] = val;
                     el.style['-khtml-opacity'] = val;
                  }

                  break;
               default :
                  el.style[camel] = val;
            }


         };

         util.Dom.batch(el, f, util.Dom, true);
      },

      /**
       * Gets the current position of an element based on page coordinates.  Element must be part of the DOM tree to have page coordinates (display:none or elements not appended return false).
       * @param {String/HTMLElement/Array} el Accepts a string to use as an ID, an actual DOM reference, or an Array of IDs and/or HTMLElements
       @ return {Array} The XY position of the element(s)
       */
      getXY: function(el) {
         var f = function(el) {

         // has to be part of document to have pageXY
            if (el.offsetParent === null || this.getStyle(el, 'display') == 'none') {
               return false;
            }

            var parentNode = null;
            var pos = [];
            var box;

            if (el.getBoundingClientRect) { // IE
               box = el.getBoundingClientRect();
               var doc = document;
               if ( !this.inDocument(el) && parent.document != document) {// might be in a frame, need to get its scroll
                  doc = parent.document;

                  if ( !this.isAncestor(doc.documentElement, el) ) {
                     return false;
                  }

               }

               var scrollTop = Math.max(doc.documentElement.scrollTop, doc.body.scrollTop);
               var scrollLeft = Math.max(doc.documentElement.scrollLeft, doc.body.scrollLeft);

               return [box.left + scrollLeft, box.top + scrollTop];
            }
            else { // safari, opera, & gecko
               pos = [el.offsetLeft, el.offsetTop];
               parentNode = el.offsetParent;
               if (parentNode != el) {
                  while (parentNode) {
                     pos[0] += parentNode.offsetLeft;
                     pos[1] += parentNode.offsetTop;
                     parentNode = parentNode.offsetParent;
                  }
               }
               if (isSafari && this.getStyle(el, 'position') == 'absolute' ) { // safari doubles in some cases
                  pos[0] -= document.body.offsetLeft;
                  pos[1] -= document.body.offsetTop;
               }
            }

            if (el.parentNode) { parentNode = el.parentNode; }
            else { parentNode = null; }

            while (parentNode && parentNode.tagName.toUpperCase() != 'BODY' && parentNode.tagName.toUpperCase() != 'HTML')
            { // account for any scrolled ancestors
               if (util.Dom.getStyle(parentNode, 'display') != 'inline') { // work around opera inline scrollLeft/Top bug
                  pos[0] -= parentNode.scrollLeft;
                  pos[1] -= parentNode.scrollTop;
               }

               if (parentNode.parentNode) { parentNode = parentNode.parentNode; }
               else { parentNode = null; }
            }


            return pos;
         };

         return util.Dom.batch(el, f, util.Dom, true);
      },

      /**
       * Gets the current X position of an element based on page coordinates.  The element must be part of the DOM tree to have page coordinates (display:none or elements not appended return false).
       * @param {String/HTMLElement/Array} el Accepts a string to use as an ID, an actual DOM reference, or an Array of IDs and/or HTMLElements
       * @return {String/Array} The X position of the element(s)
       */
      getX: function(el) {
         var f = function(el) {
            return util.Dom.getXY(el)[0];
         };

         return util.Dom.batch(el, f, util.Dom, true);
      },

      /**
       * Gets the current Y position of an element based on page coordinates.  Element must be part of the DOM tree to have page coordinates (display:none or elements not appended return false).
       * @param {String/HTMLElement/Array} el Accepts a string to use as an ID, an actual DOM reference, or an Array of IDs and/or HTMLElements
       * @return {String/Array} The Y position of the element(s)
       */
      getY: function(el) {
         var f = function(el) {
            return util.Dom.getXY(el)[1];
         };

         return util.Dom.batch(el, f, util.Dom, true);
      },

      /**
       * Set the position of an html element in page coordinates, regardless of how the element is positioned.
       * The element(s) must be part of the DOM tree to have page coordinates (display:none or elements not appended return false).
       * @param {String/HTMLElement/Array} el Accepts a string to use as an ID, an actual DOM reference, or an Array of IDs and/or HTMLElements
       * @param {Array} pos Contains X & Y values for new position (coordinates are page-based)
       * @param {Boolean} noRetry By default we try and set the position a second time if the first fails
       */
      setXY: function(el, pos, noRetry) {
         var f = function(el) {
            var style_pos = this.getStyle(el, 'position');
            if (style_pos == 'static') { // default to relative
               this.setStyle(el, 'position', 'relative');
               style_pos = 'relative';
            }

            var pageXY = this.getXY(el);
            if (pageXY === false) { // has to be part of doc to have pageXY
               return false;
            }

            var delta = [ // assuming pixels; if not we will have to retry
               parseInt( this.getStyle(el, 'left'), 10 ),
               parseInt( this.getStyle(el, 'top'), 10 )
            ];

            if ( isNaN(delta[0]) ) {// in case of 'auto'
               delta[0] = (style_pos == 'relative') ? 0 : el.offsetLeft;
            }
            if ( isNaN(delta[1]) ) { // in case of 'auto'
               delta[1] = (style_pos == 'relative') ? 0 : el.offsetTop;
            }

            if (pos[0] !== null) { el.style.left = pos[0] - pageXY[0] + delta[0] + 'px'; }
            if (pos[1] !== null) { el.style.top = pos[1] - pageXY[1] + delta[1] + 'px'; }

            var newXY = this.getXY(el);

            // if retry is true, try one more time if we miss
            if (!noRetry && (newXY[0] != pos[0] || newXY[1] != pos[1]) ) {
               this.setXY(el, pos, true);
            }

         };

         util.Dom.batch(el, f, util.Dom, true);
      },

      /**
       * Set the X position of an html element in page coordinates, regardless of how the element is positioned.
       * The element must be part of the DOM tree to have page coordinates (display:none or elements not appended return false).
       * @param {String/HTMLElement/Array} el Accepts a string to use as an ID, an actual DOM reference, or an Array of IDs and/or HTMLElements.
       * @param {Int} x to use as the X coordinate for the element(s).
       */
      setX: function(el, x) {
         util.Dom.setXY(el, [x, null]);
      },

      /**
       * Set the Y position of an html element in page coordinates, regardless of how the element is positioned.
       * The element must be part of the DOM tree to have page coordinates (display:none or elements not appended return false).
       * @param {String/HTMLElement/Array} el Accepts a string to use as an ID, an actual DOM reference, or an Array of IDs and/or HTMLElements.
       * @param {Int} x to use as the Y coordinate for the element(s).
       */
      setY: function(el, y) {
         util.Dom.setXY(el, [null, y]);
      },

      /**
       * Returns the region position of the given element.
       * The element must be part of the DOM tree to have a region (display:none or elements not appended return false).
       * @param {String/HTMLElement/Array} el Accepts a string to use as an ID, an actual DOM reference, or an Array of IDs and/or HTMLElements.
       * @return {Region/Array} A Region or array of Region instances containing "top, left, bottom, right" member data.
       */
      getRegion: function(el) {
         var f = function(el) {
            var region = new YAHOO.util.Region.getRegion(el);
            return region;
         };

         return util.Dom.batch(el, f, util.Dom, true);
      },

      /**
       * Returns the width of the client (viewport).
       * Now using getViewportWidth.  This interface left intact for back compat.
       * @return {Int} The width of the viewable area of the page.
       */
      getClientWidth: function() {
         return util.Dom.getViewportWidth();
      },

      /**
       * Returns the height of the client (viewport).
       * Now using getViewportHeight.  This interface left intact for back compat.
       * @return {Int} The height of the viewable area of the page.
       */
      getClientHeight: function() {
         return util.Dom.getViewportHeight();
      },

      /**
       * Returns a array of HTMLElements with the given class
       * For optimized performance, include a tag and/or root node if possible
       * @param {String} className The class name to match against
       * @param {String} tag (optional) The tag name of the elements being collected
       * @param {String/HTMLElement} root (optional) The HTMLElement or an ID to use as the starting point
       * @return {Array} An array of elements that have the given class name
       */
      getElementsByClassName: function(className, tag, root) {
         var method = function(el) { return util.Dom.hasClass(el, className) };
         return util.Dom.getElementsBy(method, tag, root);
      },

      /**
       * Determines whether an HTMLElement has the given className
       * @param {String/HTMLElement/Array} el The element or collection to test
       * @param {String} className the class name to search for
       * @return {Boolean/Array} A boolean value or array of boolean values
       */
      hasClass: function(el, className) {
         var re = new RegExp('(?:^|\\s+)' + className + '(?:\\s+|$)');

         var f = function(el) {
            return re.test(el['className']);
         };

         return util.Dom.batch(el, f, util.Dom, true);
      },

      /**
       * Adds a class name to a given element or collection of elements
       * @param {String/HTMLElement/Array} el The element or collection to add the class to
       * @param {String} className the class name to add to the class attribute
       */
      addClass: function(el, className) {
         var f = function(el) {
            if (this.hasClass(el, className)) { return; } // already present


            el['className'] = [el['className'], className].join(' ');
         };

         util.Dom.batch(el, f, util.Dom, true);
      },

      /**
       * Removes a class name from a given element or collection of elements
       * @param {String/HTMLElement/Array} el The element or collection to remove the class from
       * @param {String} className the class name to remove from the class attribute
       */
      removeClass: function(el, className) {
         var re = new RegExp('(?:^|\\s+)' + className + '(?:\\s+|$)', 'g');

         var f = function(el) {
            if (!this.hasClass(el, className)) { return; } // not present


            var c = el['className'];
            el['className'] = c.replace(re, ' ');
            if ( this.hasClass(el, className) ) { // in case of multiple adjacent
               this.removeClass(el, className);
            }

         };

         util.Dom.batch(el, f, util.Dom, true);
      },

      /**
       * Replace a class with another class for a given element or collection of elements.
       * If no oldClassName is present, the newClassName is simply added.
       * @param {String/HTMLElement/Array} el The element or collection to remove the class from
       * @param {String} oldClassName the class name to be replaced
       * @param {String} newClassName the class name that will be replacing the old class name
       */
      replaceClass: function(el, oldClassName, newClassName) {
         if (oldClassName === newClassName) { // avoid infinite loop
            return false;
         };

         var re = new RegExp('(?:^|\\s+)' + oldClassName + '(?:\\s+|$)', 'g');

         var f = function(el) {

            if ( !this.hasClass(el, oldClassName) ) {
               this.addClass(el, newClassName); // just add it if nothing to replace
               return; // note return
            }

            el['className'] = el['className'].replace(re, ' ' + newClassName + ' ');

            if ( this.hasClass(el, oldClassName) ) { // in case of multiple adjacent
               this.replaceClass(el, oldClassName, newClassName);
            }
         };

         util.Dom.batch(el, f, util.Dom, true);
      },

      /**
       * Generates a unique ID
       * @param {String/HTMLElement/Array} el (optional) An optional element array of elements to add an ID to (no ID is added if one is already present)
       * @param {String} prefix (optional) an optional prefix to use (defaults to "yui-gen")
       * @return {String/Array} The generated ID, or array of generated IDs (or original ID if already present on an element)
       */
      generateId: function(el, prefix) {
         prefix = prefix || 'yui-gen';
         el = el || {};

         var f = function(el) {
            if (el) {
               el = util.Dom.get(el);
            } else {
               el = {}; // just generating ID in this case
            }

            if (!el.id) {
               el.id = prefix + id_counter++;
            } // dont override existing


            return el.id;
         };

         return util.Dom.batch(el, f, util.Dom, true);
      },

      /**
       * Determines whether an HTMLElement is an ancestor of another HTML element in the DOM hierarchy
       * @param {String/HTMLElement} haystack The possible ancestor
       * @param {String/HTMLElement} needle The possible descendent
       * @return {Boolean} Whether or not the haystack is an ancestor of needle
       */
      isAncestor: function(haystack, needle) {
         haystack = util.Dom.get(haystack);
         if (!haystack || !needle) { return false; }

         var f = function(needle) {
            if (haystack.contains && !isSafari) { // safari "contains" is broken
               return haystack.contains(needle);
            }
            else if ( haystack.compareDocumentPosition ) {
               return !!(haystack.compareDocumentPosition(needle) & 16);
            }
            else { // loop up and test each parent
               var parent = needle.parentNode;

               while (parent) {
                  if (parent == haystack) {
                     return true;
                  }
                  else if (!parent.tagName || parent.tagName.toUpperCase() == 'HTML') {
                     return false;
                  }

                  parent = parent.parentNode;
               }
               return false;
            }
         };

         return util.Dom.batch(needle, f, util.Dom, true);
      },

      /**
       * Determines whether an HTMLElement is present in the current document
       * @param {String/HTMLElement} el The element to search for
       * @return {Boolean} Whether or not the element is present in the current document
       */
      inDocument: function(el) {
         var f = function(el) {
            return this.isAncestor(document.documentElement, el);
         };

         return util.Dom.batch(el, f, util.Dom, true);
      },

      /**
       * Returns a array of HTMLElements that pass the test applied by supplied boolean method
       * For optimized performance, include a tag and/or root node if possible
       * @param {Function} method A boolean method to test elements with
       * @param {String} tag (optional) The tag name of the elements being collected
       * @param {String/HTMLElement} root (optional) The HTMLElement or an ID to use as the starting point
       */
      getElementsBy: function(method, tag, root) {
         tag = tag || '*';
         root = util.Dom.get(root) || document;

         var nodes = [];
         var elements = root.getElementsByTagName(tag);

         if ( !elements.length && (tag == '*' && root.all) ) {
            elements = root.all; // IE < 6
         }

         for (var i = 0, len = elements.length; i < len; ++i)
         {
            if ( method(elements[i]) ) { nodes[nodes.length] = elements[i]; }
         }


         return nodes;
      },

      /**
       * Returns an array of elements that have had the supplied method applied.
       * The method is called with the element(s) as the first arg, and the optional param as the second ( method(el, o) )
       * @param {String/HTMLElement/Array} el (optional) An element or array of elements to apply the method to
       * @param {Function} method The method to apply to the element(s)
       * @param {Generic} (optional) o An optional arg that is passed to the supplied method
       * @param {Boolean} (optional) override Whether or not to override the scope of "method" with "o"
       * @return {HTMLElement/Array} The element(s) with the method applied
       */
      batch: function(el, method, o, override) {
         var id = el;
         el = util.Dom.get(el);

         var scope = (override) ? o : window;

         if (!el || el.tagName || !el.length) { // is null or not a collection (tagName for SELECT and others that can be both an element and a collection)
            if (!el) {
               return false;
            }
            return method.call(scope, el, o);
         }

         var collection = [];

         for (var i = 0, len = el.length; i < len; ++i) {
            if (!el[i]) {
               id = id[i];
            }
            collection[collection.length] = method.call(scope, el[i], o);
         }

         return collection;
      },

      /**
       * Returns the height of the document.
       * @return {Int} The height of the actual document (which includes the body and its margin).
       */
      getDocumentHeight: function() {
         var scrollHeight=-1,windowHeight=-1,bodyHeight=-1;
         var marginTop = parseInt(util.Dom.getStyle(document.body, 'marginTop'), 10);
         var marginBottom = parseInt(util.Dom.getStyle(document.body, 'marginBottom'), 10);

         var mode = document.compatMode;

         if ( (mode || isIE) && !isOpera ) { // (IE, Gecko)
            switch (mode) {
               case 'CSS1Compat': // Standards mode
                  scrollHeight = ((window.innerHeight && window.scrollMaxY) ?  window.innerHeight+window.scrollMaxY : -1);
                  windowHeight = [document.documentElement.clientHeight,self.innerHeight||-1].sort(function(a, b){return(a-b);})[1];
                  bodyHeight = document.body.offsetHeight + marginTop + marginBottom;
                  break;

               default: // Quirks
                  scrollHeight = document.body.scrollHeight;
                  bodyHeight = document.body.clientHeight;
            }
         } else { // Safari & Opera
            scrollHeight = document.documentElement.scrollHeight;
            windowHeight = self.innerHeight;
            bodyHeight = document.documentElement.clientHeight;
         }

         var h = [scrollHeight,windowHeight,bodyHeight].sort(function(a, b){return(a-b);});
         return h[2];
      },

      /**
       * Returns the width of the document.
       * @return {Int} The width of the actual document (which includes the body and its margin).
       */
      getDocumentWidth: function() {
         var docWidth=-1,bodyWidth=-1,winWidth=-1;
         var marginRight = parseInt(util.Dom.getStyle(document.body, 'marginRight'), 10);
         var marginLeft = parseInt(util.Dom.getStyle(document.body, 'marginLeft'), 10);

         var mode = document.compatMode;

         if (mode || isIE) { // (IE, Gecko, Opera)
            switch (mode) {
               case 'CSS1Compat': // Standards mode
                  docWidth = document.documentElement.clientWidth;
                  bodyWidth = document.body.offsetWidth + marginLeft + marginRight;
                  break;

               default: // Quirks
                  bodyWidth = document.body.clientWidth;
                  docWidth = document.body.scrollWidth;
                  break;
            }
         } else { // Safari
            docWidth = document.documentElement.clientWidth;
            bodyWidth = document.body.offsetWidth + marginLeft + marginRight;
         }

         var w = Math.max(docWidth, bodyWidth);
         return w;
      },

      /**
       * Returns the current height of the viewport.
       * @return {Int} The height of the viewable area of the page (excludes scrollbars).
       */
      getViewportHeight: function() {
         var height = -1;
         var mode = document.compatMode;

         if ( (mode || isIE) && !isOpera ) {
            switch (mode) { // (IE, Gecko)
               case 'CSS1Compat': // Standards mode
                  height = document.documentElement.clientHeight;
                  break;

               default: // Quirks
                  height = document.body.clientHeight;
            }
         } else { // Safari, Opera
            height = self.innerHeight;
         }

         return height;
      },

      /**
       * Returns the current width of the viewport.
       * @return {Int} The width of the viewable area of the page (excludes scrollbars).
       */

      getViewportWidth: function() {
         var width = -1;
         var mode = document.compatMode;

         if (mode || isIE) { // (IE, Gecko, Opera)
            switch (mode) {
            case 'CSS1Compat': // Standards mode
               width = document.documentElement.clientWidth;
               break;

            default: // Quirks
               width = document.body.clientWidth;
            }
         } else { // Safari
            width = self.innerWidth;
         }
         return width;
      }
   };
}();

/**
 * @class A region is a representation of an object on a grid.  It is defined
 * by the top, right, bottom, left extents, so is rectangular by default.  If
 * other shapes are required, this class could be extended to support it.
 *
 * @param {int} t the top extent
 * @param {int} r the right extent
 * @param {int} b the bottom extent
 * @param {int} l the left extent
 * @constructor
 */
YAHOO.util.Region = function(t, r, b, l) {

    /**
     * The region's top extent
     * @type int
     */
    this.top = t;

    /**
     * The region's top extent as index, for symmetry with set/getXY
     * @type int
     */
    this[1] = t;

    /**
     * The region's right extent
     * @type int
     */
    this.right = r;

    /**
     * The region's bottom extent
     * @type int
     */
    this.bottom = b;

    /**
     * The region's left extent
     * @type int
     */
    this.left = l;

    /**
     * The region's left extent as index, for symmetry with set/getXY
     * @type int
     */
    this[0] = l;
};

/**
 * Returns true if this region contains the region passed in
 *
 * @param  {Region}  region The region to evaluate
 * @return {boolean}        True if the region is contained with this region,
 *                          else false
 */
YAHOO.util.Region.prototype.contains = function(region) {
    return ( region.left   >= this.left   &&
             region.right  <= this.right  &&
             region.top    >= this.top    &&
             region.bottom <= this.bottom    );

};

/**
 * Returns the area of the region
 *
 * @return {int} the region's area
 */
YAHOO.util.Region.prototype.getArea = function() {
    return ( (this.bottom - this.top) * (this.right - this.left) );
};

/**
 * Returns the region where the passed in region overlaps with this one
 *
 * @param  {Region} region The region that intersects
 * @return {Region}        The overlap region, or null if there is no overlap
 */
YAHOO.util.Region.prototype.intersect = function(region) {
    var t = Math.max( this.top,    region.top    );
    var r = Math.min( this.right,  region.right  );
    var b = Math.min( this.bottom, region.bottom );
    var l = Math.max( this.left,   region.left   );

    if (b >= t && r >= l) {
        return new YAHOO.util.Region(t, r, b, l);
    } else {
        return null;
    }
};

/**
 * Returns the region representing the smallest region that can contain both
 * the passed in region and this region.
 *
 * @param  {Region} region The region that to create the union with
 * @return {Region}        The union region
 */
YAHOO.util.Region.prototype.union = function(region) {
    var t = Math.min( this.top,    region.top    );
    var r = Math.max( this.right,  region.right  );
    var b = Math.max( this.bottom, region.bottom );
    var l = Math.min( this.left,   region.left   );

    return new YAHOO.util.Region(t, r, b, l);
};

/**
 * toString
 * @return string the region properties
 */
YAHOO.util.Region.prototype.toString = function() {
    return ( "Region {"    +
             "top: "       + this.top    +
             ", right: "   + this.right  +
             ", bottom: "  + this.bottom +
             ", left: "    + this.left   +
             "}" );
};

/**
 * Returns a region that is occupied by the DOM element
 *
 * @param  {HTMLElement} el The element
 * @return {Region}         The region that the element occupies
 * @static
 */
YAHOO.util.Region.getRegion = function(el) {
    var p = YAHOO.util.Dom.getXY(el);

    var t = p[1];
    var r = p[0] + el.offsetWidth;
    var b = p[1] + el.offsetHeight;
    var l = p[0];

    return new YAHOO.util.Region(t, r, b, l);
};

/////////////////////////////////////////////////////////////////////////////

/**
 * @class
 *
 * A point is a region that is special in that it represents a single point on
 * the grid.
 *
 * @param {int} x The X position of the point
 * @param {int} y The Y position of the point
 * @constructor
 * @extends Region
 */
YAHOO.util.Point = function(x, y) {
   if (x instanceof Array) { // accept output from Dom.getXY
      y = x[1];
      x = x[0];
   }

    /**
     * The X position of the point, which is also the right, left and index zero (for Dom.getXY symmetry)
     * @type int
     */

    this.x = this.right = this.left = this[0] = x;

    /**
     * The Y position of the point, which is also the top, bottom and index one (for Dom.getXY symmetry)
     * @type int
     */
    this.y = this.top = this.bottom = this[1] = y;
};

YAHOO.util.Point.prototype = new YAHOO.util.Region();

/*
Copyright (c) 2006, Yahoo! Inc. All rights reserved.
Code licensed under the BSD License:
http://developer.yahoo.net/yui/license.txt
Version: 0.11.3
*/

/**
 * The Connection Manager provides a simplified interface to the XMLHttpRequest
 * object.  It handles cross-browser instantiantion of XMLHttpRequest, negotiates the
 * interactive states and server response, returning the results to a pre-defined
 * callback you create.
 * @ class
 */
YAHOO.util.Connect =
{
/**
   * Array of MSFT ActiveX ids for XMLHttpRequest.
   * @private
   * @type array
   */
	_msxml_progid:[
		'MSXML2.XMLHTTP.3.0',
		'MSXML2.XMLHTTP',
		'Microsoft.XMLHTTP'
		],

  /**
   * Object literal of HTTP header(s)
   * @private
   * @type object
   */
	_http_header:{},

  /**
   * Determines if HTTP headers are set.
   * @private
   * @type boolean
   */
	_has_http_headers:false,

 /**
  * Determines if a default header of
  * Content-Type of 'application/x-www-form-urlencoded'
  * will be added to any client HTTP headers sent for POST
  * transactions.
  * @private
  * @type boolean
  */
    _use_default_post_header:true,

 /**
  * Determines if a default header of
  * Content-Type of 'application/x-www-form-urlencoded'
  * will be added to any client HTTP headers sent for POST
  * transactions.
  * @private
  * @type boolean
  */
    _default_post_header:'application/x-www-form-urlencoded',

 /**
  * Property modified by setForm() to determine if the data
  * should be submitted as an HTML form.
  * @private
  * @type boolean
  */
    _isFormSubmit:false,

 /**
  * Property modified by setForm() to determine if a file(s)
  * upload is expected.
  * @private
  * @type boolean
  */
    _isFileUpload:false,

 /**
  * Property modified by setForm() to set a reference to the HTML
  * form node if the desired action is file upload.
  * @private
  * @type object
  */
    _formNode:null,

 /**
  * Property modified by setForm() to set the HTML form data
  * for each transaction.
  * @private
  * @type string
  */
    _sFormData:null,

 /**
  * Collection of polling references to the polling mechanism in handleReadyState.
  * @private
  * @type object
  */
    _poll:{},

 /**
  * Queue of timeout values for each transaction callback with a defined timeout value.
  * @private
  * @type object
  */
    _timeOut:{},

  /**
   * The polling frequency, in milliseconds, for HandleReadyState.
   * when attempting to determine a transaction's XHR readyState.
   * The default is 50 milliseconds.
   * @private
   * @type int
   */
     _polling_interval:50,

  /**
   * A transaction counter that increments the transaction id for each transaction.
   * @private
   * @type int
   */
     _transaction_id:0,

  /**
   * Member to add an ActiveX id to the existing xml_progid array.
   * In the event(unlikely) a new ActiveX id is introduced, it can be added
   * without internal code modifications.
   * @public
   * @param string id The ActiveX id to be added to initialize the XHR object.
   * @return void
   */
	setProgId:function(id)
	{
		this._msxml_progid.unshift(id);
	},

  /**
   * Member to enable or disable the default POST header.
   * @public
   * @param boolean b Set and use default header - true or false .
   * @return void
   */
	setDefaultPostHeader:function(b)
	{
		this._use_default_post_header = b;
	},

  /**
   * Member to modify the default polling interval.
   * @public
   * @param {int} i The polling interval in milliseconds.
   * @return void
   */
	setPollingInterval:function(i)
	{
		if(typeof i == 'number' && isFinite(i)){
			this._polling_interval = i;
		}
	},

  /**
   * Instantiates a XMLHttpRequest object and returns an object with two properties:
   * the XMLHttpRequest instance and the transaction id.
   * @private
   * @param {int} transactionId Property containing the transaction id for this transaction.
   * @return connection object
   */
	createXhrObject:function(transactionId)
	{
		var obj,http;
		try
		{
			// Instantiates XMLHttpRequest in non-IE browsers and assigns to http.
			http = new XMLHttpRequest();
			//  Object literal with http and tId properties
			obj = { conn:http, tId:transactionId };
		}
		catch(e)
		{
			for(var i=0; i<this._msxml_progid.length; ++i){
				try
				{
					// Instantiates XMLHttpRequest for IE and assign to http.
					http = new ActiveXObject(this._msxml_progid[i]);
					//  Object literal with http and tId properties
					obj = { conn:http, tId:transactionId };
					break;
				}
				catch(e){}
			}
		}
		finally
		{
			return obj;
		}
	},

  /**
   * This method is called by asyncRequest to create a
   * valid connection object for the transaction.  It also passes a
   * transaction id and increments the transaction id counter.
   * @private
   * @return object
   */
	getConnectionObject:function()
	{
		var o;
		var tId = this._transaction_id;

		try
		{
			o = this.createXhrObject(tId);
			if(o){
				this._transaction_id++;
			}
		}
		catch(e){}
		finally
		{
			return o;
		}
	},

  /**
   * Method for initiating an asynchronous request via the XHR object.
   * @public
   * @param {string} method HTTP transaction method
   * @param {string} uri Fully qualified path of resource
   * @param callback User-defined callback function or object
   * @param {string} postData POST body
   * @return {object} Returns the connection object
   */
	asyncRequest:function(method, uri, callback, postData)
	{
		var o = this.getConnectionObject();

		if(!o){
			return null;
		}
		else{
			if(this._isFormSubmit){
				if(this._isFileUpload){
					this.uploadFile(o.tId, callback, uri);
					this.releaseObject(o);
					return;
				}

				//If the specified HTTP method is GET, setForm() will return an
				//encoded string that is concatenated to the uri to
				//create a querystring.
				if(method == 'GET'){
					uri += "?" +  this._sFormData;
				}
				else if(method == 'POST'){
					//If POST data exists in addition to the HTML form data,
					//it will be concatenated to the form data.
					postData = (postData?this._sFormData + "&" + postData:this._sFormData);
				}
				this._sFormData = '';
			}

			o.conn.open(method, uri, true);

			if(this._isFormSubmit || (postData && this._use_default_post_header)){
				this.initHeader('Content-Type', this._default_post_header);
				if(this._isFormSubmit){
					this._isFormSubmit = false;
				}
			}

			if(this._has_http_headers){
				this.setHeader(o);
			}

			this.handleReadyState(o, callback);
			o.conn.send(postData?postData:null);

			return o;
		}
	},

  /**
   * This method serves as a timer that polls the XHR object's readyState
   * property during a transaction, instead of binding a callback to the
   * onreadystatechange event.  Upon readyState 4, handleTransactionResponse
   * will process the response, and the timer will be cleared.
   *
   * @private
   * @param {object} o The connection object
   * @param callback User-defined callback object
   * @return void
   */
    handleReadyState:function(o, callback)
    {

		var oConn = this;

		if(callback && callback.timeout){
			this._timeOut[o.tId] = window.setTimeout(function(){ oConn.abort(o, callback, true); }, callback.timeout);
		}

		this._poll[o.tId] = window.setInterval(
			function(){
				if(o.conn && o.conn.readyState == 4){
					window.clearInterval(oConn._poll[o.tId]);
					delete oConn._poll[o.tId];

					if(callback && callback.timeout){
						delete oConn._timeOut[o.tId];
					}

					oConn.handleTransactionResponse(o, callback);
				}
			}
		,this._polling_interval);
    },

  /**
   * This method attempts to interpret the server response and
   * determine whether the transaction was successful, or if an error or
   * exception was encountered.
   *
   * @private
   * @param {object} o The connection object
   * @param {object} callback - User-defined callback object
   * @param {boolean} determines if the transaction was aborted.
   * @return void
   */
    handleTransactionResponse:function(o, callback, isAbort)
    {
		// If no valid callback is provided, then do not process any callback handling.
		if(!callback){
			this.releaseObject(o);
			return;
		}

		var httpStatus, responseObject;

		try
		{
			if(o.conn.status !== undefined && o.conn.status != 0){
				httpStatus = o.conn.status;
			}
			else{
				httpStatus = 13030;
			}
		}
		catch(e){
			// 13030 is the custom code to indicate the condition -- in Mozilla/FF --
			// when the o object's status and statusText properties are
			// unavailable, and a query attempt throws an exception.
			httpStatus = 13030;
		}

		if(httpStatus >= 200 && httpStatus < 300){
			try
			{
				responseObject = this.createResponseObject(o, callback.argument);
				if(callback.success){
					if(!callback.scope){
						callback.success(responseObject);
					}
					else{
						// If a scope property is defined, the callback will be fired from
						// the context of the object.
						callback.success.apply(callback.scope, [responseObject]);
					}
				}
			}
			catch(e){}
		}
		else{
			try
			{
				switch(httpStatus){
					// The following case labels are wininet.dll error codes that may be encountered.
					case 12002: // Server timeout
					case 12029: // 12029 to 12031 correspond to dropped connections.
					case 12030:
					case 12031:
					case 12152: // Connection closed by server.
					case 13030: // See above comments for variable status.
						responseObject = this.createExceptionObject(o.tId, callback.argument, (isAbort?isAbort:false));
						if(callback.failure){
							if(!callback.scope){
								callback.failure(responseObject);
							}
							else{
								callback.failure.apply(callback.scope, [responseObject]);
							}
						}
						break;
					default:
						responseObject = this.createResponseObject(o, callback.argument);
						if(callback.failure){
							if(!callback.scope){
								callback.failure(responseObject);
							}
							else{
								callback.failure.apply(callback.scope, [responseObject]);
							}
						}
				}
			}
			catch(e){}
		}

		this.releaseObject(o);
		responseObject = null;
    },

  /**
   * This method evaluates the server response, creates and returns the results via
   * its properties.  Success and failure cases will differ in the response
   * object's property values.
   * @private
   * @param {object} o The connection object
   * @param {} callbackArg User-defined argument or arguments to be passed to the callback
   * @return object
   */
    createResponseObject:function(o, callbackArg)
    {
		var obj = {};
		var headerObj = {};

		try
		{
			var headerStr = o.conn.getAllResponseHeaders();
			var header = headerStr.split('\n');
			for(var i=0; i < header.length; i++){
				var delimitPos = header[i].indexOf(':');
				if(delimitPos != -1){
					headerObj[header[i].substring(0,delimitPos)] = header[i].substring(delimitPos + 2);
				}
			}
		}
		catch(e){}

		obj.tId = o.tId;
		obj.status = o.conn.status;
		obj.statusText = o.conn.statusText;
		obj.getResponseHeader = headerObj;
		obj.getAllResponseHeaders = headerStr;
		obj.responseText = o.conn.responseText;
		obj.responseXML = o.conn.responseXML;

		if(typeof callbackArg !== undefined){
			obj.argument = callbackArg;
		}

		return obj;
    },

  /**
   * If a transaction cannot be completed due to dropped or closed connections,
   * there may be not be enough information to build a full response object.
   * The failure callback will be fired and this specific condition can be identified
   * by a status property value of 0.
   *
   * If an abort was successful, the status property will report a value of -1.
   *
   * @private
   * @param {int} tId Transaction Id
   * @param callbackArg The user-defined arguments
   * @param isAbort Determines if the exception is an abort.
   * @return object
   */
    createExceptionObject:function(tId, callbackArg, isAbort)
    {
		var COMM_CODE = 0;
		var COMM_ERROR = 'communication failure';
		var ABORT_CODE = -1;
		var ABORT_ERROR = 'transaction aborted';

		var obj = {};

		obj.tId = tId;
		if(isAbort){
			obj.status = ABORT_CODE;
			obj.statusText = ABORT_ERROR;
		}
		else{
			obj.status = COMM_CODE;
			obj.statusText = COMM_ERROR;
		}

		if(callbackArg){
			obj.argument = callbackArg;
		}

		return obj;
    },

  /**
   * Public method that stores the custom HTTP headers for each transaction.
   * @public
   * @param {string} label The HTTP header label
   * @param {string} value The HTTP header value
   * @return void
   */
	initHeader:function(label,value)
	{
		if(this._http_header[label] === undefined){
			this._http_header[label] = value;
		}
		else{
			// Concatenate multiple values, comma-delimited,
			// for the same header label,
			this._http_header[label] =  value + "," + this._http_header[label];
		}

		this._has_http_headers = true;
	},

  /**
   * Accessor that sets the HTTP headers for each transaction.
   * @private
   * @param {object} o The connection object for the transaction.
   * @return void
   */
	setHeader:function(o)
	{
		for(var prop in this._http_header){
			if(this._http_header.hasOwnProperty(prop)){
				o.conn.setRequestHeader(prop, this._http_header[prop]);
			}
		}
		delete this._http_header;

		this._http_header = {};
		this._has_http_headers = false;
	},

  /**
   * This method assembles the form label and value pairs and
   * constructs an encoded string.
   * asyncRequest() will automatically initialize the
   * transaction with a HTTP header Content-Type of
   * application/x-www-form-urlencoded.
   * @public
   * @param {string || object} form id or name attribute, or form object.
   * @param {string} optional boolean to indicate SSL environment.
   * @param {string || boolean} optional qualified path of iframe resource for SSL in IE.
   * @return void
   */
	setForm:function(formId, isUpload, secureUri)
	{
		this._sFormData = '';
		if(typeof formId == 'string'){
			// Determine if the argument is a form id or a form name.
			// Note form name usage is deprecated by supported
			// here for legacy reasons.
			var oForm = (document.getElementById(formId) || document.forms[formId]);
		}
		else if(typeof formId == 'object'){
			// Treat argument as an HTML form object.
			var oForm = formId;
		}
		else{
			return;
		}

		// If the isUpload argument is true, setForm will call createFrame to initialize
		// an iframe as the form target.
		//
		// The argument secureURI is also required by IE in SSL environments
		// where the secureURI string is a fully qualified HTTP path, used to set the source
		// of the iframe, to a stub resource in the same domain.
		if(isUpload){
			this.createFrame(secureUri?secureUri:null);
			this._isFormSubmit = true;
			this._isFileUpload = true;
			this._formNode = oForm;

			return;
		}

		var oElement, oName, oValue, oDisabled;
		var hasSubmit = false;

		// Iterate over the form elements collection to construct the
		// label-value pairs.
		for (var i=0; i<oForm.elements.length; i++){
			oElement = oForm.elements[i];
			oDisabled = oForm.elements[i].disabled;
			oName = oForm.elements[i].name;
			oValue = oForm.elements[i].value;

			// Do not submit fields that are disabled or
			// do not have a name attribute value.
			if(!oDisabled && oName)
			{
				switch (oElement.type)
				{
					case 'select-one':
					case 'select-multiple':
						for(var j=0; j<oElement.options.length; j++){
							if(oElement.options[j].selected){
								if(window.ActiveXObject){
									this._sFormData += encodeURIComponent(oName) + '=' + encodeURIComponent(oElement.options[j].attributes['value'].specified?oElement.options[j].value:oElement.options[j].text) + '&';
								}
								else{
									this._sFormData += encodeURIComponent(oName) + '=' + encodeURIComponent(oElement.options[j].hasAttribute('value')?oElement.options[j].value:oElement.options[j].text) + '&';
								}

							}
						}
						break;
					case 'radio':
					case 'checkbox':
						if(oElement.checked){
							this._sFormData += encodeURIComponent(oName) + '=' + encodeURIComponent(oValue) + '&';
						}
						break;
					case 'file':
						// stub case as XMLHttpRequest will only send the file path as a string.
					case undefined:
						// stub case for fieldset element which returns undefined.
					case 'reset':
						// stub case for input type reset button.
					case 'button':
						// stub case for input type button elements.
						break;
					case 'submit':
						if(hasSubmit == false){
							this._sFormData += encodeURIComponent(oName) + '=' + encodeURIComponent(oValue) + '&';
							hasSubmit = true;
						}
						break;
					default:
						this._sFormData += encodeURIComponent(oName) + '=' + encodeURIComponent(oValue) + '&';
						break;
				}
			}
		}

		this._isFormSubmit = true;
		this._sFormData = this._sFormData.substr(0, this._sFormData.length - 1);
	},

  /**
   * Creates an iframe to be used for form file uploads.  It is remove from the
   * document upon completion of the upload transaction.
   *
   * @private
   * @param {string} optional qualified path of iframe resource for SSL in IE.
   * @return void
   */
	createFrame:function(secureUri){

		// IE does not allow the setting of id and name attributes as object
		// properties via createElement().  A different iframe creation
		// pattern is required for IE.
		var frameId = 'yuiIO' + this._transaction_id;
		if(window.ActiveXObject){
			var io = document.createElement('<IFRAME id="' + frameId + '" name="' + frameId + '">');

			// IE will throw a security exception in an SSL environment if the
			// iframe source isn't set.
			if(typeof secureUri == 'boolean'){
				io.src = 'javascript:false';
			}
			else{
				io.src = secureUri;
			}
		}
		else{
			var io = document.createElement('IFRAME');
			io.id = frameId;
			io.name = frameId;
		}

		io.style.position = 'absolute';
		io.style.top = '-1000px';
		io.style.left = '-1000px';

		document.body.appendChild(io);
	},

  /**
   * Uploads HTML form, including files/attachments,  targeting the
   * iframe created in createFrame.
   *
   * @private
   * @param {int} id The transaction id.
   * @param {object} callback - User-defined callback object.
   * @param {string} uri Fully qualified path of resource.
   * @return void
   */
	uploadFile:function(id, callback, uri){

		var frameId = 'yuiIO' + id;
		var io = document.getElementById(frameId);

		// Initialize the HTML form properties in case they are
		// not defined in the HTML form.
		this._formNode.action = uri;
		this._formNode.enctype = 'multipart/form-data';
		this._formNode.method = 'POST';
		this._formNode.target = frameId;
		this._formNode.submit();

		// Reset form status properties.
		this._formNode = null;
		this._isFileUpload = false;
		this._isFormSubmit = false;

		// Create the upload callback handler that fires when the iframe
		// receives the load event.  Subsequently, the event handler is detached
		// and the iframe removed from the document.

		var uploadCallback = function()
		{
			var obj = {};

			obj.tId = id;
			obj.responseText = io.contentWindow.document.body?io.contentWindow.document.body.innerHTML:null;
			obj.responseXML = io.contentWindow.document.XMLDocument?io.contentWindow.document.XMLDocument:io.contentWindow.document;
			obj.argument = callback.argument;

			if(callback.upload){
				if(!callback.scope){
					callback.upload(obj);
				}
				else{
					callback.upload.apply(callback.scope, [obj]);
				}
			}

			if(YAHOO.util.Event){
				YAHOO.util.Event.removeListener(io, "load", uploadCallback);
			}
			else if(window.ActiveXObject){
				io.detachEvent('onload', uploadCallback);
			}
			else{
				io.removeEventListener('load', uploadCallback, false);
			}
			setTimeout(function(){ document.body.removeChild(io); }, 100);
		};


		// Bind the onload handler to the iframe to detect the file upload response.
		if(YAHOO.util.Event){
			YAHOO.util.Event.addListener(io, "load", uploadCallback);
		}
		else if(window.ActiveXObject){
			io.attachEvent('onload', uploadCallback);
		}
		else{
			io.addEventListener('load', uploadCallback, false);
		}
	},

  /**
   * Public method to terminate a transaction, if it has not reached readyState 4.
   * @public
   * @param {object} o The connection object returned by asyncRequest.
   * @param {object} callback  User-defined callback object.
   * @param {string} isTimeout boolean to indicate if abort was a timeout.
   * @return void
   */
	abort:function(o, callback, isTimeout)
	{
		if(this.isCallInProgress(o)){
			o.conn.abort();
			window.clearInterval(this._poll[o.tId]);
			delete this._poll[o.tId];
			if(isTimeout){
				delete this._timeOut[o.tId];
			}

			this.handleTransactionResponse(o, callback, true);

			return true;
		}
		else{
			return false;
		}
	},

  /**
   * Public method to check if the transaction is still being processed.
   * @public
   * @param {object} o The connection object returned by asyncRequest
   * @return boolean
   */
	isCallInProgress:function(o)
	{
		// if the XHR object assigned to the transaction has not been dereferenced,
		// then check its readyState status.  Otherwise, return false.
		if(o.conn){
			return o.conn.readyState != 4 && o.conn.readyState != 0;
		}
		else{
			//The XHR object has been destroyed.
			return false;
		}
	},

  /**
   * Dereference the XHR instance and the connection object after the transaction is completed.
   * @private
   * @param {object} o The connection object
   * @return void
   */
	releaseObject:function(o)
	{
		//dereference the XHR instance.
		o.conn = null;
		//dereference the connection object.
		o = null;
	}
};/*
 * jQuery 1.2.6 - New Wave Javascript
 *
 * Copyright (c) 2008 John Resig (jquery.com)
 * Dual licensed under the MIT (MIT-LICENSE.txt)
 * and GPL (GPL-LICENSE.txt) licenses.
 *
 * $Date: 2008-05-24 14:22:17 -0400 (Sat, 24 May 2008) $
 * $Rev: 5685 $
 */
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