I have tried to understand how to use a onclick for a adsense unit. Some say that this wont be possible and some say the opposite. What is correct ?
Is there anyway to get the onclick for a adsense unit. So when a adsense unit has been clicked, it will do something also.
You can’t. In order to prevent abuse, AdSense ads (and most major ad serving systems) run within an iframe specifically to isolate them from your page.