adding Adsense code to the theme files

I want to add Adsense code underneath my header on my site, http://reeserichards.com

I would like it to look very similar to another one of my sites:

http://instantlyfallasleep.com

I don’t that an Adsense plugin exists which allows you to add the code to the header, footer and side widget areas as well as the more conventional pages on a post / page.

Also, it’d be nice to be able to turn Adsense on or off for each individual page. Anyway, those are features you can add to the next generation of Adsense plugins.

For now, I’ll settle for the line # where I need to put my Adsense code as well as an example of the exact code that accompanies the Adsense code.