function FirefoxPlugin() {
  if ((typeof window.sidebar == "object") && (typeof window.sidebar.addSearchEngine == "function")){
    window.sidebar.addSearchEngine( "http://www.ranking-counter.com/plugin/search.src",
                                    "http://www.ranking-counter.com/images/bmark.gif",
                                    "ranking-counter.com search",
                                    "ranking-counter.com");
  }
}