function addEngine()
{
  if ((typeof window.sidebar == "object") && (typeof window.sidebar.addSearchEngine == "function"))
  {
      window.sidebar.addSearchEngine(
          "http://www.rtsintercoms.com/opensearch.src",  /* engine URL */
          "http://www.rtsintercoms.com/binary/Telex.ico",  /* icon URL */
          "RTS® & Telex® Intercom",                                         /* engine name */
          "Intercom" );                                               /* category name */
  } else {
     if (window.external.AddSearchProvider) {
        window.external.AddSearchProvider('http://www.rtsintercoms.com/opensearch.xml');
     }
  }
}