Hello svibuk :).
You may have made a table with teh additional help of CSS, though tables and widths don't go together nicely. Your best bet, as mentioned before, is to just ditch the tables and allow yoru structure to be made with <div>'s and use floating to get column effects.
You may not like the idea of having to start your structure again from scratch, however it's for the best. Tables aren't meant to be the structure of a document. They are only meant to hold tabular data :).