MSDN has the functionality I'm looking for here. Since microsoft recognizes the usefulness of a split container for the web, is this page using a publically available microsoft created, .net based split container?
There is a Javascript js file in the page that references all of the containers. Alas, that script doesn't appear to be publicly available.
However, this should do the trick:
jQuery Splitter Plugin
http://methvin.com/splitter/
An online demo is here:
http://methvin.com/splitter/vsplitter.html