Does anyone know if it is legit to have an adsense box which scrolls down as you scroll the page? So say I have content in the middle of the page but whenever the user scrolls down the page then the Google Adsense block will scroll down as well.
If you modify any part of the adsense code you will get banned for sure. I would just place the adsense banners in key locations of your site and that's all. Don't do something that may be against Google's terms.