I followed Google's instructions (https://www.google.com/adsense/support/bin/static.py?page=alternateads.html&sourceid=aso&subid=ww-ww-et-asui&medium=link#html) on how to use a clickable image as an alternate ad when no adsense ads are served, however I don't think it is working correctly and I am having a hard time testing it. First off, it is almost impossible to get an alternate ad to show up. When refreshing my pages 1/100000 times shows a "page not found" where the adsense normally shows up. I'm wondering if this "page not found" is supposed to be the alternate ad or just an error on google's part. I use an include (ie <!-- #include file="includes/ads.inc" -->) to pull the adsense code, so is it a possibility that that would be the reason the alternate ad isnt loading correctly? Does anyone know a good way to force the alternate ad to show up (for testing purposes)? I've tried putting my adsense code into a blank html page and it STILL shows ads.