if ((navigator.appName) == "Microsoft Internet Explorer") {
  document.write("<p class=\"w1\">You appear to be using Internet Explorer, and you have JavaScript turned on. ");
  document.write("According to <a href=\"http://www.theregister.co.uk/2004/06/28/cert_ditch_explorer/\">The Register</a>, ");
  document.write("<a href=\"http://www.us-cert.gov\">CERT</a> has identified IE as a significant security risk and recommends that you switch browsers. ");
  document.write("Why not check out <a href=\"http://www.mozilla.org\">Firefox or Mozilla</a>?</p><hr width=85%>");
 }