function popup(url, width, height, name) {
	if (url) {
		var params = "resizable=yes,scrollbars=yes,status=yes";
		if (!isNaN(width)) {params += ",width=" + width;}
		if (!isNaN(height)) {params += ",height=" + height;}
		
		var newWindow = window.open(url, name, params);
		return newWindow;
	}
	return false;
}