I was looking for the same solution a bit time ago, and found the tool which allows me to perform both way database conversion (mdb->mysql and mysql->mdb)
The tool might be found at http://www.data-conversions.net/
I was handling the local access db, updating it with all up-to-date information, then just synchronize it with mysql db at web server, in this way I was able to have my web site (small online shop) carrying the same content as I had in access db. Best Regards