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Not sure I'm getting what you mean? Do you mean that the coupons take you on a new page?

Sorry, I explained that badly. I'm running Chrome (10.0.648.204) and each coupon click is resulting in another entry in the browser back history.

Yep, I can reproduce the problem but I'm not aware what triggers it. Maybe the JS changing the iframe's src makes a new history record in Chrome.

I'll have to investigate this further.