Originally from :http://movingtofreedom.org/2010/12/20/problems-and-solutions-with-ad-location-in-google-custom-search-engine/

I got an email from Google warning me to upgrade to their Custom Search Engine (CSE) on my site because the old site search I was using is going away. I’m using Google’s “AdSense for search,” where you can display search results on your own site using an iframe. To get this convenience and nifty feature, you have to accept Google ads as part of the bargain.