static public function changeSortOrder( $nodeID, $sortingField, $sortingOrder = false )
    {
        $curNode = eZContentObjectTreeNode::fetch( $nodeID );
        if ( is_object( $curNode ) )
        {
             $db = eZDB::instance();
             $db->begin();
             $curNode->setAttribute( 'sort_field', $sortingField );
             $curNode->setAttribute( 'sort_order', $sortingOrder );
             $curNode->store();
             $db->commit();
             $object = $curNode->object();
             eZContentCacheManager::clearContentCacheIfNeeded( $object->attribute( 'id' ) );
        }
        return array( 'status' => true );
    }