Someone

function rcs_search_autocomplete($keywords) {
  $results = search_data($keywords, 'node');

  if ($results) {
    $results = theme('box', t('Search results'), $results);
  }
  else {
    $results = theme('box', t('Your search yielded no results'), search_help('search#noresults'));
  }

  $items[$keywords] = $results;

  print drupal_to_js($items);
  exit();
}