If you are interested in using this mod with Jay's mods, I highly recommend it. Here are links to his hacks:
This is the link to Jay's developer mod
http://www.ztcdd.org/DD/index.php?topic=9290.0
This is the link to Jay's Map Editor mod (remember you should only use one map editor at a time)
http://www.ztcdd.org/DD/index.php?topic=9291.0
This is the link to the dll that provides strings for Jay's Hacks. Although it is not required, I totally suggest you use it. Just remember to put it into the zoo tycoon installation folder with the other dll files. It does not go in your dlupdate folder!
http://www.ztcdd.org/DG/index.php?topic=5353.0