navHover = function() {

 var lis = document.getElementById("sidebar").document.getElementById("navmenu").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);