There is no problem with Safari or Internet Explorer 7. No problem in Firefox unless you resized browser to less than 1024 width (say 800px wide).
Check the template at: http://irishdeaf.com/template2008.html and resize Firefox browser to smaller and then scroll to the right. You will see the background isn't centering to the website but to your browser window! Is that a bug?
Also I'm not sure why there is a space on left when there's no space on the right?