function popup(width, height) {
	
	var winLeft = (screen.width / 2) - (width / 2);
	var winTop = (screen.height / 2)- (height / 2);
	
	var popup = window.open('', 'popup', 'width=' + width + ', height=' + height + ', scrollbars=no, toolbar=no, status=no, resizable=no, menubar=no, location=no, directories=no, top=' + winTop + ', left=' + winLeft );
	popup.focus();
	return false;
}