sfHover = function() 
{
    if(document.getElementById("mainMenu") != null)
    {
      var sfEls = document.getElementById("mainMenu").getElementsByTagName("li");
    for (var i=0; i<sfEls.length; i++) 
    {
    sfEls[i].onmouseover=function() 
    {
      this.className+=" sfhover";
    }
    sfEls[i].onmouseout=function() 
    {
      this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
    }
    }
  }
}
if (window.attachEvent) window.attachEvent("onload", sfHover);