If I'm using AIM on a PC with Vista, how do I video chat with somebody using

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iChat on a Mac? My friend said he doesn't see the "Video" icon next to my screenname on his iChat buddy list, and when I try to start a Video chat using the button on the Send bar in AIM, it says "Camera Not Found." However, I can see myself on the screen in the window on the program software for the camera. Any help???