public function deleteAction()
 {
     // check acl
     if (!Knowledgeroot_Acl::iAmAllowed('content_' . $this->_getParam('id'), 'delete')) {
         $this->_redirect('page/' . $this->_getParam('content_page'));
     }
     $content = new Knowledgeroot_Content($this->_getParam('id'));
     $parent = $content->getParent();
     $content->delete();
     $this->_redirect('page/' . $parent);
 }