public function deleteStory($userstory_id)
 {
     $db_userstory = new Model_DbTable_UserStory();
     $db_userstory->deleteStory($userstory_id);
     $db_userstory_content = new Model_DbTable_UserStoryContent();
     $db_userstory_content->deleteField($userstory_id);
     $db_userstory_category = new Model_DbTable_UserStoryRelated();
     $db_userstory_category->deleteField($userstory_id);
     $db_userstory_tag = new Model_DbTable_UserStoryTag();
     $db_userstory_tag->deleteField($userstory_id);
 }