var q
	function popupArt(sURL, pType) {	
		
		// decide dimensions
		switch (pType) {
			case "sign":
				sWidth=580;
				sHeight=382;
				break;
			case "extras":
				sHeight=355;
				sWidth=560;
				break;
			case "colors":
				sHeight=555;
				sWidth=560;
				break;
		}
		if (q) { q.close(); }
		q = popup(sURL,pType,sWidth,sHeight);
	}