Doesn't seem to work in Opera 5 and not in Netscape 6.1 either. Opera 5 reports parsing errors in script (no details though), Netscape 6.1 doesn't seem to do anything at all.
I double checked that I have javascript enabled in both browsers.

As you already ended up slicing the images, please set the ALT- and TITLE-texts as proposed in this thread. You could still use the javascript approach for the IE5 users (though I donīt like the fact that the info immediately pops up).

Also, I generally disable JScript (which includes JavaScript or vice versa) in IE.

cu,
sven
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proud owner of MkII 40GB & MkIIa 60GB both lit by God and HiJacked by Lord