// Kiểm tra tính hợp lệ của email
function isEmail(s)
	{
	var str=s;
	var filter=/^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i
	if (filter.test(str))
		{
		return (true);
		}
	return (false);
}
// Mở một của sổ mới
function new_window(url,width, height){
		window.open (url, "new_window", "width="+ width + ", height="+ height +", resizable=1,scrollbars=yes");
	}
function viewsign(id){
		window.open ("viewsign.php?id="+id, "new_window", "width=350,height=300,resizable=1,scrollbars=yes");
	}

function openLarge(URL,W,H){
		hWindow=window.open("popup.php?"+URL,"Large","toolbar=no,width="+W+",height="+H+",status=no,scrollbars=auto,resize=yes,menubars=no");
 }

//Highlight image script- By Dynamic Drive

function makevisible(cur,which){
strength=(which==0)? 0.6 : 1

if (cur.style.MozOpacity)
cur.style.MozOpacity=strength
else if (cur.filters)
cur.filters.alpha.opacity=strength*100
}