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