my spry menu sits off screen in firefox

I don't know how to describe this problem but I seem to have everything working ok now in IE and Firefox... BUT.... in firefox part of my menu is visible in the browser to the far left of page on my widescreen monitor...
I have played for hours trying to fix this and now I'm lost... any help would be appreciated... www.tory.net.au/armchair

Cheers & thanks in advance!
Peter

I just took a look, i didn't find anything weird on the page...

Try validating (http://validator.w3.org/check) it.