I'm pretty sure you can do it by having some extra parameter in your script, call it 'frame'. If frame is null, generate the frame set, and for the frame documents, reference your same CGI script with the frame variable set. If the frame variable is set, generate the appropriate content for that frame and output it.

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Dr. Michael K. Neylon - mneylon-pm@masemware.com || "You've left the lens cap of your mind on again, Pinky" - The Brain