$form = new Application_Form_Comment();
    $form->submit->setLabel('Comment');
    if ($this->getRequest()->isPost()) {
        $formData = $this->getRequest()->getPost();
        if ($form->isValid($formData)) {
        $comment = new Application_Model_DbTable_Comments();
        $comment->addComment($formData['comment'], $id);
            $this->_helper->redirector('index');
        } else {
            $form->populate($formData);
        }
    $this->view->form = $form;
    }