function menu_local_tasks($level = 0) {
  static $tabs = array(), $parents = array(), $parents_done = array();
  if (empty($tabs)) {
    $router_item = menu_get_item();
    $map = arg(NULL);
    do {
      // Tabs are router items that have the same parent. If there is a new
      // parent, let's add it the queue.
      if (!empty($router_item->parent)) {
        $parents[] = $router_item->parent;
        // Do not add the same item twice.
        $router_item->parent = '';
      }
      $parent = array_shift($parents);
      // Do not process the same parent twice.
      if (isset($parents_done[$parent])) {
        continue;
      }
      // This loads all the tabs.
      $result = db_query("SELECT * FROM {menu} WHERE parent = '%s' AND tab = 1 ORDER BY vancode", $parent);
      $tabs_current = array();
      unset($next_router_item);
      while ($item = db_fetch_object($result)) {
        // This call changes the path from for example user/[] to user/123 and
        // also determines whether we are allowed to access it.
        list($access, , $path) = _menu_access($item, $map, MENU_RENDER_LINK);
        if ($access) {
          // MENU_DEFAULT_LOCAL_TASK links to its parent.
          $link = l($item->title, $item->type == MENU_DEFAULT_LOCAL_TASK ? substr($path, 0, strrpos($path, '/')) : $path);
          $depth = $item->depth;
          // We check for the active tab.
          if ($item->path == $router_item->path || (!$router_item->tab && $item->type == MENU_DEFAULT_LOCAL_TASK) || $path == $_GET['q']) {
            $tabs_current[] = array('class' => 'active', 'data' => $link);
            if ($item->parent) {
              // Let's try to find the router item one level up.
              $next_router_item = db_fetch_object(db_query("SELECT path, tab, parent FROM {menu} WHERE path = '%s'", $item->parent));
            }
            // We will need to inspect one level down.
            $parents[] = $item->path;
          }
          else {
            $tabs_current[] = $link;
          }
        }
      }
      // If there are tabs, let's add them
      if ($tabs_current) {
        $tabs[$depth] = $tabs_current;
      }
      $parents_done[$parent] = TRUE;
      if (isset($next_router_item)) {
        $router_item = $next_router_item;
      }
      else {
        unset($router_item);
      }
    } while ($parents);
    // Sort by depth
    ksort($tabs);
    // Remove the depth, we are interested only in their relative placement.
    $tabs = array_values($tabs);
  }
  return isset($tabs[$level]) ? $tabs[$level] : array();
}