If you look at this Fiddle: http://jsfiddle.net/kyHHx/1/
you'll see what I mean. Some of the issue I mentioned before appear outside of jsFiddle but you can see what I mean anyway.
The splitter does not expand to 100% despite being told too. Also, I haven't a clue on how to make the right pane be 200px and the left the remainder without specify the entire horizontal row width in pixels (which I don't want).