I've done a search all over here and the other style sites and couldn't come up with anything, I hope this is the right place to post this!

I've just re-designed my site, and have a header and left navigation menu. It's all done in CSS following this tutorial.
When I click on a users name in a post, or 'Thread Tools' or 'Search' the menu appears down and to the right of where it should be - as if it treats the edge of the header and the menu as the edge of the page.
Screen shot here - http://tinypic.com/aey1jb.jpg
Is there any way around this, or anything I can do? The forum is in a div which has the border set to sit where it is - out from the top and the left of the page.
Many thanks,
James
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