Look around... the code to do it is already out there, I think.
http://www.gossamer-threads.com/scri...ql/plugins.htm
Quote:
Add_RandImage
This plugin allows you to have a similar addition system to AltaVista.com. A random image is generated, requiring the users to enter the 8 letters/numbers before they can submit their link. REQUIRES Image::Magick or GD LIBRARY TO BE INSTALLED!
Author: Andy Newby - Price: 25
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That might help you out a bit.
Alex