protected function _getSearchParamsUrl($sSearch, $sCatId, $sVendorId, $sManufacturerId)
    {
        $sParams = "searchparam=" . urlencode($sSearch);
        if ($sCatId) {
            $sParams .= "&amp;searchcnid=" . urlencode($sCatId);
        }

        if ($sVendorId) {
            $sParams .= "&amp;searchvendor=" . urlencode($sVendorId);
        }

        if ($sManufacturerId) {
            $sParams .= "&amp;searchmanufacturer=" . urlencode($sManufacturerId);
        }

        return $sParams;
    }