var isNS = (navigator.appName == "Netscape");
var browserVersion = parseInt(navigator.appVersion);
var layerRef = (isNS) ? "document['" : "document.all['";
var styleRef = (isNS) ? "']" : "'].style";
//following is used for other references besides layers
var layerEndRef = "']";
if(isNS && (browserVersion > 4))
{
	layerRef = "document.getElementById('"
	styleRef = "').style";
	layerEndRef = "')";
}