navHover = function() {

      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"), "");
            }
      }
}

if (window.attachEvent) window.attachEvent("onload", navHover);