var isNav4 = false;
var isNav = false;
var isIE4 = false;
var isIE5 = false;
var isIE = false;

if(parseInt(navigator.appVersion) >= 4 && navigator.appName == "Netscape")
	{
		isNav=true;
		isNav4=true;
	}
else if(parseInt(navigator.appVersion) >= 4 &&
	navigator.appName == "Microsoft Internet Explorer")
	{
	isIE=true;
	if(navigator.appVersion.indexOf("MSIE 4") != -1)
		{
		isIE4 = true;
		}
	if(navigator.appVersion.indexOf("MSIE 5") != -1)
		{
		isIE5 = true;
		}
	}