How can I build a game like crabball?

[lananci]

Hello everyone,
I need a little help here about building a game like crabball.
You can try it on

http://www.bestoftulsa.com/gamesonline/crabball.shtml

I'm a newbie (actually more than 1 year, but I study Flash by myself in my freetime... you know, night, weekend... I'm so tired!). I figured out that it's a mix of collision, gravity and stuff. I understood them (I suppose) separated. But I have no idea on how to merge them.

So, if there's someone that could give me some hint, I would be really, really grateful.

I've been searching for something like it, I swear, but I didn't find a thing. If there is a tutorial or so, please don't be mad at me.

Thanks