function addEngine() {
  if ((typeof window.sidebar == "object") && (typeof window.sidebar.addSearchEngine == "function")) {
    window.sidebar.addSearchEngine("http://one-way.ovh.org/francais/plugins/plugff.src","http://one-way.ovh.org/francais/plugins/plugff.png","One-WAY's Website - FR","0" );
  } else {
  alert("Votre navigateur n'est malheureusement pas compatible.");
  }
}