I've just had a thought on this one. Try editing docs/trio-applet.htm and change:

<param name="archive" value="trio-applet-0.1.4.jar"/>

to:

<param name="archive" value="trio-0.1.4.jar"/>

This will take longer to load, but may solve your problem. If so, I should be able to add some more bit 'n pieces to the applet jar to make it work.

Cheers
Paul