EOS retrieve an erased image??!

[JSGR & HHBK]

Hello all.  I was running, not really thinking and I erased some images from 
a friend's wedding this past weekend!  I have a 20D and it's loaded with a 
SanDisk 2, 512MB card.  Does anyone know any way to retrieve these images? 
Once I realized what I'd done I stopped taking photos and there's still 
space left on the card.  Thanks for your time!
Jerry Ritt


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