navHover = function() {
var lis = document.getElementById("mainMenu").getElementsByTagName("LI");
for (var i=0; i<lis.length; i++) {
	lis[i].onmouseover=function() {this.className+=" iehover";}
	lis[i].onmouseout=function() {this.className=this.className.replace(new RegExp(" iehover\\b"), "");}
}}
if (window.attachEvent) window.attachEvent("onload", navHover);