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But it seems I was wasting my time trying to help you anyway, as you've already received the same advice somewhere else:
http://www.java-forums.org/new-java/40161-jpanel-motion.html...

You're going to have to define "motion". And what thread is that sleep on? It looks like it's on the EDT, which is pretty horrible. But you also don't want to do GUI updates on a thread that isn't...