change how worldpay payment module for oscommerce works

The contribution can be found here if you want to check the code: [login to view URL],882/download,5291 If you choose worldpay as the payment method in oscommerce, after checkout conformation you are directed to worldpays site to make the payment. When you sucessfully make the payment or cancel the payment, you are directed back to the oscommerce site. A brief "sucess" or "canceled" message is displayed in the oscommerce site when you are directed back from the worldpay site (from the file [login to view URL]). Then you are automatically forwarded to either [login to view URL] (if you sucessfully made the payment in worldpay) or [login to view URL] (if you cancelled the payment in Worldpay) Im looking for a coder who can remove the "sucess" or "canceled" stage, and simply have worldpay direct back to [login to view URL] or checkout_payment.php. Please give me your best bid and time for completion.