$tree = taxonomy_get_tree($field['vid'],content_taxonomy_field_get_parent($field), -1, 1);
  
if (is_array($tree)) {
  foreach ($tree as $term) {
    _content_taxonomy_localize_term($term);

    foreach (taxonomy_get_children($term->tid) as $t) {
      _content_taxonomy_localize_term($t);
      $options[$term->name][$t->tid] = check_plain($t->name);
    }

  }
}

return $options;