Extending colour: in a Fluid table layout

[Mer]

I have a three column w3 validated page.
Im using css for the formatting and colour.

My problem is how to extend the colour in my right hand colomn
to match the longest column,

I think Im too far along to change to divs and i need to be able to deal
with old browsers.

Im using Lauri Harpfs table layout for accessibilty
(puts the content column first in tabs while looking like its in the middle)

Anyone have any suggestions.
Im a bit lost.

[kelly23]

Have a url?

[ray326]

In a pure 3 col table layout all three tds are the same height by definition. Backgrounds assigned to each td will be the same height as the others as long as they repeat-y.