function OpenPopup(url, w, h, target)
{
var w, h, t, l, popup;
w = 20 + w;
h = 20 + h;
var	l = Math.floor((screen.width-w)/2);
var t = Math.floor((screen.height-h)/2)-100;

if (url!='')
	popup = window.open(url,target,'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=yes,width='+ w + ',height=' + h +',top=' + t +',left=' + l +'');
else
	popup = window.open('',target,'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=yes,width='+ w + ',height=' + h +',top=' + t +',left=' + l +'');
popup.focus();
}