function safariDetect() {

     var ua = navigator.userAgent.toLowerCase();

      if (ua.indexOf('safari/') != -1){

          alert("We've noticed you're using the Safari web browser to view this site. Unfortunately not all our site features work in Safari and you may experience problems such as logging in and posting problems or tips. We recommend viewing the site in Mozilla Firefox which can be downloaded quickly and easily for free here http://www.mozilla-europe.org/en/firefox/.");
          return true;

      }
      else {
          return false;
      }

}