mouseovers on crack

so i'm trying to toss in some nice double/triple mouseovers into this split
graphic, and i decide to start simple with a single mouseover.  well, i
can't even get that to work.  i'm using the same script i've always used
for this kind of this, but for some reason its not cutting it here.  maybe
it has to do with the way the image is split up, i'm not sure.  on mousing
over, the desired on-graphic pops up in another graphics place.  

here's the addy:
http://pubweb.nwu.edu/~phb029/

any advice?

thanks,
paul

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