Controller issue

Hi guys, I'm trying to get my ps3 controller to work with Dolphin but having no luck

I followed this vid - http://youtu.be/AJ2RKrCncwM

I downloaded motioninjoy, installed the drivers and enabled it. Seems to work fine in motioninjoy, test it the buttons work, vibrates etc.

However, when I go into Dolphin it's like the pad isn't there. It doesn't show up in GCpad at all, doesn't react when I push buttons, the "sticks" aren't a red dot

Was just hoping anyone might have an idea as to what's happening

Thanks