Is everyone on this site retarted? We don't want your "modyfied" game. It's not yours, and i can nearly garuntee you didn't have permission to modify it either..... seriously wth.
Natey poo, assuming you have some AS experience, you will need a gravity variable that constantly pushes you down, a platform that nullifies the gravity and momentum that kicks in when you press a button, and slowly dies down. so Grav, a working platform and a variable that pushes against gravity and then becomes less and less.