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Bit of a general answer... I don't think they are using frames, they could be floating a div or aligning the divs in a number of different ways. In order to get the separate scrollable areas they are likely to be using the CSS style overflow:auto on the divs to cause scrollbars to appear if the content does not fit.
You could check this thread:
"Is it possible to implement a scrollbar without frames or iframes?"
[webmasterworld.com...]
To implement the dragable border between the frame-like containers, I think they are using another div to act as a 'splitter' and then using onmousedown / onmouseup events to implement the drag-drop functionality (I think).
Hope that helps, or at least prompts further thinking.
