public function setsliderimagepositionsAction()
 {
     try {
         $image_positions = $this->getRequest()->getParam('slider_image');
         if (empty($image_positions)) {
             throw new Exception($this->_('An error occurred while sorting your slider images. Please try again later.'));
         }
         $image = new Media_Model_Library_Image();
         $image->updatePositions($image_positions);
         $html = array('success' => 1, 'reload' => 1);
     } catch (Exception $e) {
         $html = array('message' => $e->getMessage(), 'message_button' => 1, 'message_loader' => 1);
     }
     $this->_sendHtml($html);
 }