Small exploding image and fade-out effect

[Dav]

Thank you all for the fix & tips.  Here's an updated version that gives the explosion some more depth and 3D look - some pixels will grow as they move away, making them look like they are coming towards you.  Also changed it so it doesn't do EVERY pixel, but in steps of 8.  Skipping some pixels isn't very noticeable, and it runs a bit faster on my slow machine.

- Dav