navHover = function() {

var lis = document.getElementById("mainnav").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);