I have noticed a lot of blogs explaining how to change the html coding for Google’s Adsense, though, I wouldn’t do it. I’m not saying you are not able to change ’some’ of the coding, but it is not highly recommended, and supposedly you are unable to do it unless it’s approved by Google.
According to Google’s policies, it states “Don’t tamper with the AdSense code. AdSense offers a wide variety of approved formats, colors, and features in your AdSense account. Once you’ve generated your code, however, we ask that you do not alter any portion of the code or change the layout, behavior, targeting, or delivery of ads for any reason, unless specifically authorized to do so by Google.”

Again, I do see a lot of people posting “How to Change Google Adsense Coding” but it is not strongly suggested. You will be taking a risk from getting banned by Google as it does clearly state “Don’t tamper with Adsense code… unless specifically authorized to do so by Google.”

GoogleAdsense