var sfHover = function() 
{ 
 var sfEls = document.getElementById("nav").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);