Thanks for the link.
I'm looking at the tour/XML code now but don't see any butterfly moving across the screen. It does move slightly while being in one position but that is an swf animation. Perhaps the larger movement has since been switched off.
I'll keep looking at the code and see what jumps out at me

There seems to be a few actions that are perhaps not used anymore.
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Added later:
Gave up as the actions/xml are's too complicated for my brain. I decided to just create a flash movie the same size as the viewer screen with a motion tween of the balloon going across. Does exactly what I wanted plus I can make the burners come on for a few seconds before it moves up