[ubuntu] Xmonad and borders in gnome-shell

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http://ubuntuforums.org – I'm not sure if it's a proper place to ask about adjusting Xmonad, but I don't know where else to ask. I have Ubuntu 12.04 with gnome-shell (so it looks like Gnome 2 with horizontal borders on the top and the bottom of the screen) with Xmonad running. What I want to do is create a keyboard shortcut that would toggle these borders, basically switching applications on the screen to fullscreen and back. Can anyone tell me what should I write in xmonad.hs in order to achieve it? (I'm totally innocent of Haskell, unfortunately.) Thanks. (Hardware)