This is an old mode 7 prototype I was working on for a game. This bitmap masking method is also known as raycasting.
For youngers, Mode7 was used by the SNES in Supermario kart, or F-Zero.
Better mode7/Raycasts engines are available on the web, since mine is mx4 dated and new as2 has permitted bitmap manipulation , but mine is quite a fast one =p
You can move with the arrows, strafe with ctrl, jump with space and sprint with shift.
And remember to click the flash object before, in order to give it the focus.