navHover = function() { 
  var lis = document.getElementById("navUI").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);