I suggest using firefox and adding the plugin "Firebug". It shows the structure of the page and the manner in which javascript has been used. IFrames does the trick. Still, try firebug plugin and view the structure. I am sure you can proceed from there on.
Look at libraries that have tab controls. If you are talking about being able to drag and drop the panels inside the columns, libraries such as Scriptaculous have it built in with a few lines of code.
Eric
If I had asked people what they wanted, they would have said faster horses - Ford. Tiny ad:
a bit of art, as a gift, that will fit in a stocking