Change mod key in xmonad+gnome?

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http://askubuntu.com – I'm using gnome+xmonad, and I'm trying to set the mod key to the windows key. I set my .xmonad.hs file to: import XMonad import XMonad.Config.Gnome main = xmonad gnomeConfig myModMask = mod4Mask I tried to reload the file with alt+q, but no change seems to have occurred. Any suggestions? I'm far from a power user. (HowTos)