menuHover = function() {
var menuEls = document.getElementById("nav").getElementsByTagName("li");
	for (var i=0; i<menuEls.length; i++) {
		menuEls[i].onmouseover=function() {
			this.className+=" menuHover";
		}
		menuEls[i].onmouseout=function() {
			this.className=this.className.replace(new RegExp(" menuHover\\b"), "");
		} 
	}
}
if (window.attachEvent) window.attachEvent("onload", menuHover);