Atahualpa header width vs. page width

Hello,

I have modified the header of the blog to include a frame. The header should span the whole page. I have it working but would like to pad the body of the site. Here is a link to how I want to format the blog:

http://getwellstaywellathome.com/nutritional.aspx?recid=4

And here is link to how it looks now.

http://getwellstaywellathome.com/blog/

Is there a way for me to leave the header and footer at 100% but pad the body only? Thanks in advance.

Craig