// Функция показывания/прятания слоев
		browser = navigator.appName;
		browserNum = parseInt(navigator.appVersion);
		if ((browser == "Netscape") && (browserNum < 5))
		{
			// Netscape 4.x
			layerRef = "document.layers['";
			endLayerRef = "']";
			styleRef = "";
		}
		else if ((browser == "Netscape") && (browserNum >= 5))
		{
			// Netscape 6
			layerRef = "document.getElementById('";
			styleRef = ".style";
			endLayerRef = "')";
		}
		else
		{
			// Internet Explorer
			layerRef = "document.all['";
			endLayerRef = "']";
			styleRef = ".style";
		}
		
		function showLayer(layerName)
		{
			eval(layerRef + layerName + endLayerRef + styleRef + ".visibility = 'visible'");
		}
		
		function hideLayer(layerName)
		{
			eval(layerRef + layerName + endLayerRef + styleRef + ".visibility = 'hidden'");
		}