Google Adsense in header/footer

Hi, I’ve been trying to find a widget that will allow me to post adsense ads in the header and footer of my website. I paste the code but it doesn’t show on the website. Is this widget able to support adsense ads/script? Or is there another widget or other way I can put these in my header/footer of my website?

http://wordpress.org/plugins/custom-headers-and-footers/