my puzzle

[PunkSktBrdr01]

I'm modifying a DHTML map puzzle (from "The JavaScript Bible, 3rd edition, by Danny Goodman") to make a simple 16 piece puzzle. I'm having trouble making everything work after modifications. I can't figure out why the pieces in my puzzle aren't drag-able. By the way, this uses IE-specific code, and it is not meant to be cross-browser compatible. Here's links to the live code:

my puzzle (http://www.radioactiverabbit.com/site/game_puzz)
the map puzzle (http://www.radioactiverabbit.com/site/game_map)

Thanks!