function open_window(URL,szerokosc, wysokosc) {
		var NEW_WIN = null;
		NEW_WIN = window.open (URL, "WebCatalog", 
										"toolbar=no,width="+
										szerokosc+
										",height="+wysokosc+
										",directories=no, status=no,"+
										"scrollbars=auto, resize=no, menubar=no");
	}