var layerOn;

function layeroff() {
		if (layerOn == null) return;
		if (navigator.appName=="Netscape" && navigator.appVersion.indexOf("5.") != 0) {
	       	 	document.layers[layerOn].visibility = "hide";
			}else{
				document.getElementById(layerOn).style.visibility="hidden";
			}
}
function layeron(whichlayer) {
		layerOn=whichlayer;
		if (navigator.appName=="Netscape" && navigator.appVersion.indexOf("5.") != 0) 
		{
			eval("document.layers['"+whichlayer+"'].visibility = 'show'");
		}else{
			document.getElementById(whichlayer).style.visibility="visible";
		}
}