Stuff

function menu_reset_item_submit($form, &$form_state) {
  $new_item = db_fetch_array(db_query("SELECT * FROM {menu_router} WHERE path = '%s'", $form['#router_path']));
  menu_link_save(menu_build_link($new_item));
  drupal_set_message(t('The menu item was reset to its default settings.'));
  $form_state['redirect'] = 'admin/build/menu/navigation';
}