// pop window
var l,t,z;
function popWin(url,n,w,h,o) {
	if (w>screen.availWidth-12) w=screen.availWidth-12;
	if (h>screen.availHeight-48) h=screen.availHeight-48;
	l=(screen.availWidth-w-12)/2;
	t=(screen.availHeight-h-48)/2;
	z=window.open(url,n,'width='+w+',height='+h+',left='+l+',top='+t+','+o);
}