I used to be a heavy Sixaxis on Pc user and I can assure you there is a way to do it. A year ago, and I'd bet it's still the same way, you had to dedicate a bluetooth device to syncing with the Sixaxis controller.

Since then I sold my Sixaxis controller and bought a wired Xbox360 controller because the setup was a simple plug and play, but I can still point you in the right direction if you still want to use the Ps3 controller.

Here's a forum post detailing how to do it
http://forums.ps2dev.org/viewtopic.php?t=7099