/**
 * Implementation of hook_nodeapi().
 */
function menu_nodeapi($node, $op) {
  if (user_access('administer menu') && isset($node->menu)) {
    $item = $node->menu;
    switch ($op) {
      case 'delete':
        $item['delete'] = TRUE;
        // deliberate no break.
      case 'insert':
        $item['link_path'] = "node/$node->nid";
        // deliberate no break.
      case 'update':
        $function = 'menu_link_'. (empty($item['delete']) ? 'save' : 'delete');
        $function($item);
        break;
    }
  }
}