The best approach I can think of is to design that anim in
flash; create a series of buttons that control the state of the
diagram accordingly. The diagram is fairly easy to design &
should take no more than an hour to construct. The bigger picture,
of course, is as to whether or not you intend to use associated
audio with this. Not a big deal, but it may be an element you need
to plan for.
If you need help with this, feel free to contact me at