well, the odds of finding something to work with your existing setup EXACTLY out of the box is very slim. but i would think you should be able to find something close.
at the very least, you could look at the code of some scripts to get an idea how its done, then roll your own.
if your dont want to write your own, or modify an existing one yourself, im sure theres people here who would be willing to do it for you for $$$
if you making a solid effort to do it yourself, but get hung up on a certain part, im sure plenty of people here would help you. but if you want it just done for you, get your checkbook.
that being said, this is not a very difficult thing to do. if your intrested in learning php this wouldnt be a bad thing to try and do yourself.