function initMenus() {
    var oNav = document.getElementById('global-nav').getElementsByTagName('LI') || false;
    if(!oNav) return false;

    var oItem = null;
    for(var i=0; i<oNav.length; i++) {
        oItem = oNav[i];
        if(oItem.parentNode.id == 'global-nav') {
            var oImg = getImageProps(oItem.getElementsByTagName('IMG')[0]);
            window[oImg.sImg] = new Image(); window[oImg.sImg].src = oImg.sImgStr;
            window[oImg.sImg + "_on"] = new Image(); window[oImg.sImg + "_on"].src = oImg.sImgOnStr;

            oItem.onmouseover = function() {
                swapImage(this.getElementsByTagName('IMG')[0], 'on');
                menu = this.getElementsByTagName('UL')[0] || false;
                if(menu) menu.style.display = 'block';
            }
            oItem.onmouseout = function() {
                swapImage(this.getElementsByTagName('IMG')[0], 'off');
                menu = this.getElementsByTagName('UL')[0] || false;
                if(menu) menu.style.display = 'none';
            }
        } else {
            // so far, no need to control state from sub items
            oItem.onmouseover = function() { }
            oItem.onmouseout = function() { }
        }
    }
}

function swapImage(obj, state) {
    var oProps = getImageProps(obj);
    var sSrc = (state == 'on') ? oProps.sImgOnStr : oProps.sImgStr;
    obj.src = sSrc;
}

function getImageProps(obj) {
	var oImg = new Object();
		oImg.sPath = obj.src.substring( 0, obj.src.lastIndexOf('/') +1 );
		oImg.sImg = obj.src.substring(obj.src.lastIndexOf('/') +1, obj.src.lastIndexOf('.'));
		oImg.sExt = (obj.src.indexOf('.jpg') !=-1) ? '.jpg' : '.gif';
        oImg.sImgStr = oImg.sPath + oImg.sImg + oImg.sExt;
        oImg.sImgStr = oImg.sImgStr.replace('_on', '');
        oImg.sImgOnStr = oImg.sPath + oImg.sImg + "_on" + oImg.sExt;
	return oImg;
}

addEvent(window, 'load', initMenus);
/*
    Written by Jonathan Snook, http://www.snook.ca/jonathan
    Add-ons by Robert Nyman, http://www.robertnyman.com
*/

function getElementsByClassName(oElm, strTagName, strClassName){
    var arrElements = (strTagName == "*" && oElm.all)? oElm.all : oElm.getElementsByTagName(strTagName);
    var arrReturnElements = new Array();
    strClassName = strClassName.replace(/\-/g, "\\-");
    var oRegExp = new RegExp("(^|\\s)" + strClassName + "(\\s|$)");
    var oElement;
    for(var i=0; i<arrElements.length; i++){
        oElement = arrElements[i];      
        if(oRegExp.test(oElement.className)){
            arrReturnElements.push(oElement);
        }
    }
    return (arrReturnElements)
}

// 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;
};