function navHover() {
     var lis = 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"), "");
         }
     }
}