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);