function addToFavorite(favTitle){
  if ((navigator.appVersion.indexOf("MSIE") > 0) && (parseInt(navigator.appVersion) >= 4)) {
    window.external.AddFavorite(location.href, unescape(favTitle));
  }
  else window.alert('This function is supported only by IE 4.x browsers.\n If you are using a different browser,\n please press Ctrl+D (Netscape) or add this bookmark manually.');
}