function get_navigator() {
  var browser="";

  if (navigator.appName.lastIndexOf("Microsoft Internet Explorer")!=-1) {
    browser="IE";
    version=navigator.appVersion;
    version=version.substring(0,version.indexOf("."));
    if (version>"4")
      version="4";
    browser+=version;
  }
  else if (navigator.appName.lastIndexOf("Netscape")!=-1) {
    browser="NAV";
    version=navigator.appVersion;
    version=version.substring(0,version.indexOf("."));
    if (version<"4")
      version="3";
    else if (version>="4" && version<"5")
      version="4";
    else if (version>="5")
      version=6;
    browser+=version;
    // alert(navigator.appVersion+" version: "+version+" browser: "+browser);
  }
  else
    browser=navigator.appName;
  return(browser);
}