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