public function indexAction()
 {
     $id = $this->_request->getParam('respondida');
     $contatosModel = new Application_Model_Contatos();
     if (isset($id)) {
         $this->view->contatos = $contatosModel->fetchAll($contatosModel->select()->where('respondida = ?', $id));
     } else {
         $this->view->contatos = $contatosModel->fetchAll($contatosModel->select());
     }
 }