Need help with random table cell info on refresh

What I'm trying to do is a little complicated to describe, so I have created
an image as a visual aid.

Basically I have a page with frames, and two frames have tables and images
in them. Some of the images must remain static each time the page is viewed
but I would like for the other images to swap places with each other
randomly each time the page is viewed.

Please check out the image at http://www.topsearchspot.com/framediagram.htm
and reply here with suggestions on how to achieve this.

Many thanks,

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Dan