help with overflow problem in webpage

[black-ops]

Ok so what is bugging me, is the rest of the scripting ive been working on works perfectly fine. the inclusion of wordpress into my main page works fine.
However the is one slight issue on FF the page doesnt overflow and the background seems to fit perfectly on IE and Opera it overflows and shows the background color but continues for a small amount. Now all my heights are defined as ratio ie 100% but what is odd is ive validated and it works fine with the validator for CSS. Please any ideas on what ive done wrong?
Thanks.
www.kindom-hosting.com/kin/
Thanks

 

[Tripnologist]

Your content div is set to be 100% the height of the viewport. This would be fine except that you have your nav div above it.

100px (nav_box) + 100px (top margin on nav_box) + 100% of the viewport (content) = more than viewport.

 

[black-ops]

your a saviour thanks, i just checked yes it seems i was wrong there thanks again