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); 

//±£³Ö¸¸Ïîµ×É«
var preobj = null
function setva(obj){
	if(preobj!=null) preobj.className=preobj.className.replace(new RegExp("selmenu"), ""); 
	if(obj!=null){
		if(obj.className.indexOf("selmenu")==-1)obj.className+="selmenu"
		preobj = obj
	}
}

function clearva(o){
	if(o.contains(event.toElement ) == false) {
		if(preobj!=null) preobj.className=preobj.className.replace(new RegExp("selmenu"), "");
	}
}