Insert Page Level Ads code provided Google AdSense into website as it meant to be in stretch of HTML document..
You don't have to modify theme to yank Page Level Ads code and cause further issues of theme update.
You can read Google AdSense Page Level Ads Meet AdSense's ads Page-level ads.
Lightweight short code plugin is doing exactly what is meant for.
Upload the Goo Page Level Ads to your wp-content plugins directory using data sftp scp issue director etc. and upload it..
In plugin settings page enter code provided to you Google AdSense Page Level Ads.
If you message ads will start running shortly...
Script you yanked will be AS IS provided Google AdSense..
Changing theme will not affect your plugin settings at all.....
Browse the code recheck out SVN repository or subscribe to the development log RSS.......
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