A tiny code tweak! Formatting for search box and submit button?

This is code to return a search text field and a submit button along with some links to advanced search. At the moment, they are both on separate lines. I would like to put then alongside each other on the same line. Any ideas?

  else {
    // Show short textfield if appropriate (e.g., in block).
    $short ? $length = 18: $length = 30;
    $form .= form_textfield('', 'keys', $edit[keys], $length, 200, '') . form_hidden('content_type', $content_type) . form_submit(t('search'));
    if ($short) {
      $form = form($form, 'post', url('trip_search'));
    }
    else {
      $f_links[] = $content_type ? l(t('advanced search'), 'trip_search/advanced/' . $content_type): l(t('advanced search'), 'trip_search/advanced');
      $f_links[] = l(t('search tips'), 'trip_search/help');
      $form = form($form. theme('links', $f_links), 'post', url('trip_search'));
    }
  }
  return $form;

Many thanks in advance.

Mark