The website is
ModularFords
I needed to add in a side bar for my ad on the right hand side of the page.
What I did is start a table at the end of the header template, and completed it in the footer template.
That part works fine, but I have the main table set to 90% of the page width, and that also works fine, but if you are in the showthread template, the forum is even more narrow. Not sure what is causing it.