No, it's not Java scripts, there Visual Basic script's (Basically), the programmer of Visual Pinball has just added a front end that allows people to design tables and a few instuctions that VB doesn't have.
I have tried that Fruit Machine emulator, I only tried one game (Not quite as fun as when you don't win money
) and was quite impressed. I'm not really into fruit machines though, so it got deleted after the novelty wore off. If fruit machines are your bag, then you'll like it