//--- check the browser ---
browserName = navigator.appName;
browserVer = parseInt(navigator.appVersion);
if (browserName == "Netscape" && browserVer >= 4) ver = "N4";
if (browserName == "Netscape" && browserVer == 3) ver = "N3";   
if (browserName == "Netscape" && browserVer < 3) ver = "N2";    
if (browserName == "Microsoft Internet Explorer" && browserVer >= 4) ver ="IE4";
if (browserName == "Microsoft Internet Explorer" && browserVer < 4) ver ="IE3";