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Does it need to be weighted? if not you could load all your ads into a db, randomise on it, and then track the clicks out using an inbetween script which counts the clicks and then forwards the user onto wherever they are suppose to be ending up...
Would that work for you? If you are unsure on how to do this, just ask and I can give you the scripts which will do it for you, and the lines to insert into you .htaccess file (if you want the links to not show your out file link), putting them through a script means that it could allow you to put up multiple banners per sponsor on your site but only need to keep one link record for them (unless you are wanting to track which banners got clicked).
I'm not sure how best you would weight your search if you wanted to (i'm sure there is an easy way, but my minds blank)
Hope this helps anyway
Rob
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