You could *probably* write an applet that would do this, however this is going to be heavy and would require the user to have some sort of Java run-time on their pc.
This type of application, I think, would be better suited using Adobe Flash since most modern browsers support flash from the get go and Flash Movies tend to be considerably lighter then Java Applets.
Unfortunately, I can't help you outside of this since I am no Flash guru so you may want to try posting in one of those threads.
hth.
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