function show_answer (layerName) {
	if (ishow_current == 0) {
			eval(layerRef + layerName + endLayerRef + styleRef + ".visibility = 'visible'");
			ishow_current = 1;			
		}
		else {
			eval(layerRef + layerName + endLayerRef + styleRef + ".visibility = 'hidden'");
			ishow_current = 0;					
		}		
	}
	function opener(page,name,win) {
		window.open(page,name,win);
	}