function addToEngines() {
  if ((typeof window.sidebar == 'object') &&
      (typeof window.sidebar.addSearchEngine == 'function')) {
    window.sidebar.addSearchEngine('http://www.booksonline.ro/download/booksonline.ro.src',
                                   'http://www.booksonline.ro/download/booksonline.ro.png',
                                   'booksonline.ro',
                                   'booksonline.ro');
  } else {
    alert('Este nevoie de Netscape 6, Mozilla sau Firefox ' +
          'pentru a instala aceasta extensie.');
  }
}