public function executeOpinion(HTTPRequest $request)
 {
     if ($request->postExists('submit-form')) {
         $opinion = new WebsiteOpinion();
         $opinion->setUsername(htmlspecialchars($request->postData('username')));
         $opinion->setComment(htmlspecialchars($request->postData('comment')));
         $this->_opinionsManager->save($opinion);
         $this->page->smarty()->assign('isMessageSent', true);
     }
     $this->page->smarty()->assign('opinionsManager', $this->_opinionsManager);
 }