protected function getLogoImageName()
    {
        $option = $this->getParameter('sOEPayPalLogoImageOption');
        switch ($option) {
            case 'shopLogo':
                $logo = $this->getParameter('sShopLogo');
                break;
            case 'customLogo':
                $logo = $this->getParameter('sOEPayPalCustomShopLogoImage');
                break;
            case 'noLogo':
            default:
                $logo = '';

                return $logo;
        }

        return $logo;
    }