public function setUploader($value = null)
    {
        switch ($value) {
            case 'partner':
                $this->_params['uploader'] = 'partner';
                break;
            case null:
                unset($this->_params['uploader']);
                break;
            default:
                require_once 'Zend/Gdata/App/InvalidArgumentException.php';
                throw new Zend_Gdata_App_InvalidArgumentException(
                    'Unknown value for uploader');
        }
        return $this;
    }