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