I just found out how to do it.
Go to Preferences > Interface > (unclick) Open Documents as tabs and make sure Enable Floating Document Window Docking is clicked.
I do not like the background that is consistantly there. I wish there were a way to make the interface like CS4. This is clunky. Can't see any other programs open under it. I wish it were an option.
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There's actually an instant way to see multiple images in CS6 without changing preferences. Choose Window > Arrange and pick one of the tiling options at the top. I think the new tiling options are a faster way to arrange images than what was available in CS4. If you don't like the tabbed/paned display at all, the Interface preference you want to turn off is Open Documents as Tabs. Whichever way you do it, the keyboard shortcut to flip between open documents (Command-`) still works.
Sometimes it's faster to compare multiple images in Bridge, especially if you want to do a full-screen comparison (select multiple images in Bridge and choose View > Review Mode).
If you don't want to see the background, choose Window > Application Frame to turn it off. Even when it's on, you can still see windows of other applications if you drag any edge to make the application frame smaller, exactly as you would in software like Apple iPhoto.
Thank you, Conrad.