Fullscreen on Mac Emacs

gistfile1.el

;; This works with Carbon Emacs 2010

(defun mac-toggle-max-window ()
   (interactive)
   (set-frame-parameter nil 'fullscreen 
                        (if (frame-parameter nil 'fullscreen)
                            nil
                           'fullboth)))

;; Now bind it to a key  (e.g., Mac+Meta+Return)
(global-set-key [(meta super return)] 'mac-toggle-max-window)

;; On Emacs 23.3 you need a version with a patch (e.g., install via homebrew)
(global-set-key [(meta alt return)] 'ns-toggle-fullscreen)