function show_popup(showURL, extraFeatures) {
// default: width=600,height=500,status=no,resizable=no,menubar=no,toolbar=no,location=no,scrollbar=yes,top=200,left=200
	var sExtra = 'width=551,height=500,status=no,resizable=yes,menubar=no,toolbar=no,location=no,scrollbars=yes,top=200,left=200';

	if (extraFeatures == '') {
		vWinCal = window.open(showURL, "Quamnet", sExtra);
	} else {
		vWinCal = window.open(showURL, "Quamnet", extraFeatures);
	}
	vWinCal.opener = self;
}