PHP, MS Access & Transactions

Hi, folks. I have the unfortunate task of writing a PHP front-end for a client-server application that is back-ended in MS Access. I've tried using the transaction functionality in ADOdb (PHP implementation of ADO) but it doesn't work seem to work correctly, even though it says it does. If I intentionally submit a malformed query as part of a series of inserts, the ADOdb transaction supposedly rolls back, but when I look at the database, the inserts carried out before the error occurs are still there. Does anyone know if it's possible to use transactions with Access via PHP? Cheers and TIA, Pablo