sfHover = function() { 
    if (!document.getElementsByTagName) return false; 
    var sfEls = document.getElementById("nav").getElementsByTagName("li"); 
    for (var i=0; i<sfEls.length; i++) { 
        sfEls[i].onmouseover=function() { 
            this.className+=" sfhover"; 
            this.style.zIndex=8200; 
        } 
        sfEls[i].onmouseout=function() { 
            this.className=this.className.replace(new RegExp(" sfhover\\b"), ""); 
        } 
    } 


} 


if (window.attachEvent) window.attachEvent("onload", sfHover);