var nsizewidth; //��
var nsizeheight; //����
function newwin(url) {
// nsizeheight = Math.round(screen.height * 0.8);
// nsizewidth = Math.round((nsizeheight / 3) * 4);
 nsizewidth = 320;
 nsizeheight = 278;
 sub = window.open(url,"window","toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=yes,width="+nsizewidth+",height="+nsizeheight);
 x = (screen.width  - nsizewidth) / 2;
 y = (screen.height - nsizeheight) / 2;
 sub.moveTo(x,y);
}