Alice, you need a table within a table. Put your navigation table within a cell of a larger table. This can get confusing, and it is recommended that you never use more than three nested tables.

Also, when you use a large table (like I suggested), it sometimes slows down the loading of the whole page. Sometimes it is better to use several tables on a page and close each one, than to use nested tables.

I'll take a quick look at rewriting your page, and I'll PM it to you.