<!-- hide script from old browsers
var netscape_required = 4.07
var explorer_required = 3.0

var navigator_name = navigator.appName;
var navigator_version = parseFloat(navigator.appVersion);

var OLD_NETSCAPE = "VRTalk SmartUpdate requires Netscape version " +
                   netscape_required + " or higher, " +
                   "but you appear to be running version " + navigator_version +
                   ". Click <a href=\"http://home.netscape.com/download/\">here</a> to upgrade!<P>";

var OLD_EXPLORER = "VRTalk ActiveX Control requires Internet Explorer version " +
                    explorer_required + " or higher, " +
                   "but you appear to be running version " + navigator_version +
                   ". Click <a href=\"http://www.microsoft.com/windows/ie/download/\">here</a> to upgrade!<P>";

var UNKNOWN_BROWSER = "This is a unknown browser. " + 
                      "VRTalk Plug-in or ActiveX Control contained in this page cannot be viewed correctly!<P>";

if (navigator_name == "Netscape")
{
  if (navigator_version < netscape_required)
    document.write("<P>" + OLD_NETSCAPE + "\n");
}
else if (navigator_name == "Microsoft Internet Explorer") 
{
  if (navigator_version < explorer_required)
    document.write("<P>" + OLD_EXPLORER + "\n");
}
else 
{
  document.write("<P>" + UNKNOWN_BROWSER + "\n");
}
// end script hiding from old browsers -->
