public function pagingimgabycatAction()
 {
     $this->_helper->viewRenderer->setNoRender(true);
     $this->_helper->layout->disableLayout();
     if (isset($_POST['page'])) {
         $id_cat = $_POST['id_cat'];
         $position = $_POST['page'] * 20;
         $data = My_Model_Api_Quote::get_img_by_cat_pagin($position, 20, $id_cat);
         $total_row = My_Model_Api_Quote::get_count_img_cat_by_id($id_cat);
         $dataArray = array('total' => $total_row, 'data' => $data);
         echo json_encode($dataArray);
     }
 }