Some things to remember...
1st - make sure the sum of all column widths equals the specified width of your table.
2nd - don't use percentages for table/column widths if you need specific cell widths in pixels.
3rd - regardless of your specified column width, cell content can and will expand to match the content.
4th - if you don't want text to "wrap", use the nowrap attribute in the table cell
5th - every cell in at least one row must contain some kind of content - even if it's just a space ( ).
There's always a better way. The fun is trying to find it!