Accepting bitcoin split payments

I need help concerning accepting bitcoins, look at [login to view URL], That's what I need, but once the user has payed, his payment should automaticly be splitted into different addresses based on predefined percentages which came from the mysql database. Example: NEW user A pays 10$ ( in bitcoins of course ), he came to our site through a advertisement and is linked to group 1, which in the database will be related to 6 payments of : - 50% to category 1 - 25% to category 2 - 12,5% to category 3 - ... to possibility of 20 category's NEW user B pays 10$ ( in BTC ), he's linked to group 2 and this will give 6 payments of: - 50% to category 21 - 25% to category 22 - 12,5% to category 23 - ... also possibility to 20 category's down. This should be an automated process, no manual intervention needed please