Solar System Simulation - Add Moons?

http://jrgraphix.net/research/flash_sol.php

I’ve been fiddling with the Solar System at the above link - creating a fictional universe and such. I was wondering if anyone would be clued as to how to add moons? Or objects which orbit around something other than the Sun. I’m really clueless.

Ideally I need multiple Suns - with planet whose orbits rotate to keep it relative to both suns. O_o