function pop (url, width, height) {
	var top = (screen.availHeight - height) / 2;
	var left = (screen.availWidth - width) / 2;

	window.open(url, '', "width=" + width + ",height=" + height + ",top=" + top + ",left=" + left + ",scrollbars=yes,toolbar=no,location=no,menubar=no,status=no,resizable=yes");
	
	return false;
}