var nn4 = (navigator.appName.indexOf("Netscape") > -1 && navigator.appVersion.indexOf("4") > -1) ? true:false;
var ie = (document.all) ? true:false;
var nn6 = (document.getElementById) ? true:false;
function showLayer(id) {
layer = browser(id)
	if(nn4){
	layer.visibility = "visible";
	}
	else{
	layer.style.visibility = "visible";
	}
}

function hideLayer(id) {
layer = browser(id)
	if(nn4){
	layer.visibility = "hidden";
	}
	else{
	layer.style.visibility = "hidden";
	}
}
function browser(id){
var layer = (nn4) ? document.layers[id] : (ie) ? document.all[id] : document.getElementById(id);
return layer
}