Firefox not displaying my Div correctly

The bottom padding of my outermost div called "box" will not display in Firefox. The div just wont wrap fully around the other divs.

IE7 and IE6 are displaying ok however. How can I fix the Firefox issue?

www.siteoftom.com/testroundedcontent.html

I did have the problem with IE, now I corrected it and it has become FF which is has problems lol.

Think I have fixed it, I added bottom padding of 5px to the outer box div, and removed 5px bottom padding from the div called cbb.