/**
 * addEvent written by Dean Edwards, 2005
 * with input from Tino Zijdel
 *
 * http://dean.edwards.name/weblog/2005/10/add-event/
 **/
function addEvent(element, type, handler) {
        // assign each event handler a unique ID
        if (!handler.$$guid) handler.$$guid = addEvent.guid++;
        // create a hash table of event types for the element
        if (!element.events) element.events = {};
        // create a hash table of event handlers for each element/event pair
        var handlers = element.events[type];
        if (!handlers) {
                handlers = element.events[type] = {};
                // store the existing event handler (if there is one)
                if (element["on" + type]) {
                        handlers[0] = element["on" + type];
                }
        }
        // store the event handler in the hash table
        handlers[handler.$$guid] = handler;
        // assign a global event handler to do all the work
        element["on" + type] = handleEvent;
};
// a counter used to create unique IDs
addEvent.guid = 1;
function removeEvent(element, type, handler) {
        // delete the event handler from the hash table
        if (element.events && element.events[type]) {
                delete element.events[type][handler.$$guid];
        }
};
function handleEvent(event) {
        var returnValue = true;
        // grab the event object (IE uses a global event object)
        event = event || fixEvent(window.event);
        // get a reference to the hash table of event handlers
        var handlers = this.events[event.type];
        // execute each event handler
        for (var i in handlers) {
                this.$$handleEvent = handlers[i];
                if (this.$$handleEvent(event) === false) {
                        returnValue = false;
                }
        }
        return returnValue;
};
function fixEvent(event) {
        // add W3C standard event methods
        event.preventDefault = fixEvent.preventDefault;
        event.stopPropagation = fixEvent.stopPropagation;
        return event;
};
fixEvent.preventDefault = function() {
        this.returnValue = false;
};
fixEvent.stopPropagation = function() {
        this.cancelBubble = true;
};
// end from Dean Edwards
/**
 * Creates an Element for insertion into the DOM tree.
 * From http://simon.incutio.com/archive/2003/06/15/javascriptWithXML
 *
 * @param element the element type to be created.
 *                              e.g. ul (no angle brackets)
 **/
function createElement(element) {
        if (typeof document.createElementNS != 'undefined') {
                return document.createElementNS('http://www.w3.org/1999/xhtml', element);
        }
        if (typeof document.createElement != 'undefined') {
                return document.createElement(element);
        }
        return false;
}
/**
 * "targ" is the element which caused this function to be called
 * from http://www.quirksmode.org/js/events_properties.html
 **/
function getEventTarget(e) {
        var targ;
        if (!e) {
                e = window.event;
        }
        if (e.target) {
                targ = e.target;
        } else if (e.srcElement) {
                targ = e.srcElement;
        }
        if (targ.nodeType == 3) { // defeat Safari bug
                targ = targ.parentNode;
        }
        return targ;
}