var popupId = new Object();

function popup(src, winName, width, height) {
	if (!width) 	width  = 616;
	if (!height)	height = 500;
	var id = src + '@' + winName;
	if (!winName)	winName = "";
	if (!popupId[id] || popupId[id].closed == true) {
		popupId[id] = window.open(src, winName,
			'toolbar=no,location=no,directories=no,status=no,menubar=yes,scrollbars=yes,resizable=yes,copyhistory=no,' + 
			'width=' + width + ',' + 
			'height=' + height);
	}
	popupId[id].focus();
	return popupId[id];
}

function popup2(src, winName) {
	var id = src + '@' + winName;
	if (!winName)	winName = "";
	if (!popupId[id] || popupId[id].closed == true) {
		popupId[id] = window.open(src, winName);
	}
	popupId[id].focus();
	return popupId[id];
}