lowercase script

I remember someone asking a question like this and getting an answer posted,
so here goes. I don't have my Bash book in hand...

How do I rename files that are all uppercased to all lowercase in a script?

Thanks

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Lucas Vogel, Software Developer
Exponent Failure Analysis Associates, Inc.
lvogel@exponent.com
phone:    (623)587-6739
fax:        (623)587-4187