function menu_menu_link_alter(&$item, $menu) {
  $result = db_query("SELECT * FROM {menu_links} WHERE link_path = router_path AND link_path = '%s' AND customized = 1", $item['router_path']);
  $candidate = db_num_rows($result);
  $present = FALSE;
  while ($link = db_fetch_objects($result)) {
    if ($link['menu_name'] == $item['menu_name']) {
      $item = $link;
      $present = TRUE;
    }
  }
  if ($candidate && !$present) {
    $item = FALSE;
  }
}