Need help with collisions in flash game

Hi, i have made a simple flash game (its not good, but im learning and thought it would be good practice).

I have got to the point where i have a ball with simple physics, and a maze. i would like to know how i can stop it passing through the walls, and also i would like it to reset to its starting position every time it hitd the wall.

heres the link to the .fla,
http:// rapidshare. com/files/229911939/Security.fla.html


thanks. hope that made sense

anyway i'm also making a flash game and i could probably help. i use simple enough actionscript, but it can be used to create very complex things that would otherwise take years of experience with AS to create. first of all, do you use AS2? second, if you do, what, specifically, do you need help with?ill try

May I see the SWF?

which type of swf would you like, because i have 1 unfinished(but working) platformer-includes split-screen and scrolling screen + stats for characters- and i also have a simple old sniping game i also didn't finish. the rest of my stuff is old and i can't remember but i know how to do that old stuff.