Video IM on windows '98

For all sorts of reasons my laptop at home is still running windows 98. Mostly because I'm low on disk space and haven't the time or money to figure out an upgrade path.
Meanwhile I've got a webcam and want to video chat across mac/pc platforms. Yahoo is kind of working, no audio and disappointing frame rates. AIM should work - I have the latest version (5.5 at time of writing), but I've since learnt that they only support windows XP. How crappy is that?

Here's the AIM video FAQ