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);