475704 programming for gamers content - presentation purposes onl 2

I am looking to do a script from a playstation/xbox/manga game(or something very similar) which you can control using a set of console commands, say, you enter "location: urban; move 100, 0; perform: jump;" and that sets background to some urban location, makes the character move to the right by 100 points and jump. We could add some basic loops, conditional statements and so on, so we can script the whole scene. As for screen layout, having a large part of the screen showing the scene and a smaller command input box right below it seems reasonable. javascript or flash presentation preferred. Currently its for presentation purpose as my client had seen it being done by Sega. I have been quoted $150, but budget is negotiable.