I haven't set up ads for search in a while and i found it a bit infuriating for a basically first time user.
suppose you are entering a number of urls that you have selected for your 'search engine'. if you click on any of the links on the page you will be ok because they open in a new window. therefore the data you have entered is not lost. however, if you click on any of the links within the tool tips (signified by the question marks), you will go to a new page in the same window and everything you have entered will be lost. perhaps a few more target="_blank"s are in order. </rant>