David Hugh-Jones <hughjonesd@yahoo.co.uk> wrote the code.
Anders Thorssell <quine@mac.com> provided backgrounds including:
  school-background.png
  sponge-background.png
  coral-background.png
  coral-background-2.png
  (slightly edited from his originals at http://homepage.mac.com/quine )
Ryan Morin <videoboy@shaw.ca> provided some fish including:
  blue-angelfish.png
  blue-jellyfish-30.png
  blue-jellyfish-60.png
  new-yellow-fish.png
  rainbow-fish.png
  tropical-fish.png
Michael Waniek <wlot@o2.pl> provided some fish:
  chaet-fab.png
  chaet-mod.png
  henio-acumi.png
