public function checkProductAction()
 {
     $this->_helper->layout->disableLayout();
     $form_values = $this->_request->getPost();
     $item_pack_sizes = new Model_ItemPackSizes();
     $item_pack_sizes->form_values = $form_values;
     $result = $item_pack_sizes->checkProducts();
     $this->view->result = $result;
 }