I'm new to all this adsense stuff and am pretty much at a loss at the moment. I'm trying to create a Adsense for Search engine that searches a fair few sites, the problem that I'm experiencing is that once I add more than 20 sites it starts to delete the oldest urls in the list. It's rather frustrating to be honest. Is there a limit on the amount of sites that you can search or is there some way around this problem?