How to synchronize two scrollbars for divs

I have this code for file compares: http://jsfiddle.net/CrN6X/

Now it does what I need:

1. One big div that scrolls only vertically
2. Two smaller dives that scroll only horizontally

This way I can compare my files pretty easy, but I have one problem: the bottom scrollbars are accessable only when I scroll all the way down.

How can I make them float or move the scrollbar to another div, that can bee seen always, so that I don't need to scroll down the other div all the way to the bottom to access them?