var browserName=navigator.appName;

var browserVer=parseInt(navigator.appVersion);

if ((browserName=="Netscape" && browserVer<=4) ) {
	version="null";
} else  {
	version="ok"; 
}

if (version=="null"){
	document.write("<h1 align='center'><font color='red'><strong>We have detected that you are using an old browser<br>please go to <a href='http://www.netscape.com' target='_blank'>Netscape.com</a> or <a href='http://www.microsoft.com' target='_blank'>Microsoft.com</a> to update your software.</strong></font></h1>");
}