I still haven't figured it out either but there is definitely something wonky in the table setup there.

To make your site a fixed width and centered, it seems like the easiest thing to do is add another set of table tabs between the body tags in the directory file. At least by doing that it seems I've got everything contained.

Now if I could just make it actually work...

I'm still having pathing issues. Adding those lines to directory didn't help.