ieHover = function()
{
  var dropdown=document.getElementById("dropdown");
  if(dropdown)
  {
    var els = dropdown.getElementsByTagName("li");
    for (var i=0; i<els.length; i++)
    {
  		els[i].onmouseover=function() {
        this.className+=" iehover";
      }
 	  	els[i].onmouseout=function() {
       this.className=this.className.replace(new RegExp(" iehover\\b"), "");
      }
 
    }
  }
}
if (window.attachEvent) window.attachEvent("onload", ieHover);