Using CSS instead of tables

I've made an experiment page with the layout set out by css instead of
tables which I'm used to. It works very well with the exception of one
thing in ie, and two in firefox. I would really appreciate it if
someone could point me in the direction of how to sort it.

I've uploaded the page to:
http://www.website-coder.co.uk/experiments/divs.html


It works well as long as you don't have to scroll down, and there is
the descrepancy between the browsers. In IE the colour in the left
'column' continues but the background picture of the second column
stops. Whereas in firefox the colour in the left column stops as well
as the background picture of the second column. Not so important is
that in IE the right column doesn't continue up to the edge.


Any tips much appreciated!


Flic