function openPopup(url, width, height, wintitle)
{
	if (!width) width = 562;
	if (!height) height = 600;
	if (!url) return(true);
	if (!wintitle) wintitle = 'popup';

	newwin = window.open(url, wintitle, "location=yes,resizable=yes,status=yes,menubar=yes,toolbar=yes,dependent=yes,scrollbars=yes,width=" + String(width) + ",height=" + String(height));
	if (newwin)	return(false);

	return(true);
}