function calWindow(loc) {
		var x=640;
		var y=473;
		var xPos = Math.round((screen.width/1.8)-(x/2));
		var yPos = Math.round((screen.height/2.35)-(y/2));
		window.open(loc,'popup','location=no,menubar=no,toolbar=no,resizable=no,scrollbars=yes,width=' + x + ',height=' + y + ',left=' + xPos + ',top=' +yPos + ',screenX=' + xPos + ',screenY=' + yPos, true);
}