function popup(url, height) {
	var popup_window;
	popup_window = window.open(url, 'em_popup', 'width=400,height='+height+',screenx=200,screeny=100,menubar=no,toolbar=no,location=no,scrollbars=yes,resizable=yes,directories=no,status=no');
	popup_window.focus();
	return false;
}