function Popup(url, name, width, height, scroll) {
	var str = "toolbar=no,location=0,directories=no,status=no,menubar=0,scrollbars=" + scroll + ",resizable=0,copyhistory=0, height=" + height + ",width=" + width;
	if (window.screen) {
		var ah = screen.availHeight;
		var aw = screen.availWidth;

		var xc = (aw - width) / 2;
		var yc = (ah - height) / 2;

		str += ",left=" + xc;
		str += ",top=" + yc;
	}
	return window.open(url, name, str);
}