my forum only occupies half the page

[John Couper]

Hi my forum only occupies half of the page. How can I make it occupy all the availible space.
here is the link.    http://jmcphotographies.ch/forum.html
Thankyou for the help.

[Will <Nabble>]

It looks fine to me in FireFox3 and IE6. Are you seeing that the forum gets cut off at half of its height? Which browser do you use?