$xmlwriter->setHeaderMessage($l->g('error'));
 if (!empty($category_id) && $category->_db_getList('id = ' . $category_id)) {
     // Category exists
     $xmlwriter->setHeaderStatus(0);
     $xmlwriter->setHeaderMessage('OK');
     $category_data = $category->_db_list[0];
     $category->_db_freelist();
     switch ($action) {
         case 'change_listpos':
             if (empty($dir)) {
                 // Move up
                 if ($category->_db_getList('id,listpos', 'parent_id = ' . $category_data['parent_id'], 'listpos < ' . $category_data['listpos'], 'listpos DESC', 1)) {
                     $higher_cat_id = $category->_db_list[0]['id'];
                     $higher_cat_listpos = $category->_db_list[0]['listpos'];
                     // Update category
                     $category->updateCategory($category_id, false, true, null, null, null, null, $higher_cat_listpos);
                     // Update higher category
                     $category->updateCategory($higher_cat_id, false, true, null, null, null, null, $category_data['listpos']);
                 }
             } else {
                 // Move down
                 if ($category->_db_getList('id,listpos', 'parent_id = ' . $category_data['parent_id'], 'listpos > ' . $category_data['listpos'], 'listpos ASC', 1)) {
                     $lower_cat_id = $category->_db_list[0]['id'];
                     $lower_cat_listpos = $category->_db_list[0]['listpos'];
                     // Update category
                     $category->updateCategory($category_id, false, true, null, null, null, null, $lower_cat_listpos);
                     // Update lower category
                     $category->updateCategory($lower_cat_id, false, true, null, null, null, null, $category_data['listpos']);
                 }
             }
             break;