image transparency problem in a table

I apologize for cross-posting. This also went to techniques.

Would someone help this tired old boy out and look at
http://www.greycastlegallery.com/test.html for me? The buttons aren't
coming up transparent like they should. The stylesheet is at
http://www.greycastlegallery.com/mod1.css. I'm kinda tired, and it's
probably something simple, but hopefully someone's up and around to HELP
me. The database is done, the scripts are done, now the freakin'
front-end is tryin' to mess with me. BTW, I'm looking currently via IE
5.5, Win2k.

Thanks in advance,
Frank

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