sfHover = function() {
    var sfEls = document.getElementById("nav").getElementsByTagName("LI");
    if (sfEls != null)
    {
    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);