I just recently bought a new webcam. It is USB powered. For personal reasons, I wish to not use the built in webcam that came with my netbook. I want to use this new one. I love empathy, it is a great chat client. But, I can't seem to switch my default webcam in empathy from the built in webcam, to the one I just bought. So, is there a way to force empathy to use the USB powered webcam, rather than the built in webcam?