carlcamera:

what if you set the wrapper to 90% and the google ad div to 500px?  Sure the ad won't stretch, but the articles would.  and the ad width would sort of act like a min-width I would think.

Thanks for all your help! I'm very pleased with my present set up. Big leaderboard ad across the top, and the 500px search results with ads, in the middle -- it's doing well. Check it out at www.dougjoseph.net

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Sincerely,
Doug Joseph