function applyMenuEvents(){
	menuButtons = _class("a", "mainNavLink");
	for (a=0; a < menuButtons.length; a++){
		thisButton = menuButtons[a];
		img = _class("img", "menuLink", thisButton);
		addEvent(img[0], 'mouseover', rollover, false);
		addEvent(img[0], 'mouseout', rollout, false);
	}
}

function rollover(e){

	if (e == null) 
		e = window.event; 	
	var target = e.target != null ? e.target : e.srcElement;

	if (target.className == "menuLink"){
		img = target;
		aNode = img.parentNode;
		imgName = aNode.name;
		newImage = imageList[imgName].over
		img.src = newImage;
	}
}

function rollout(e){

	if (e == null) 
		e = window.event; 	
	var target = e.target != null ? e.target : e.srcElement;

	if (target.className == "menuLink"){
		img = target;
		aNode = img.parentNode;
		imgName = aNode.name;
		newImage = imageList[imgName].out
		img.src = newImage;
	}
}