(global-set-key [(meta left)] 'previous-buffer)
(global-set-key [(meta right)] 'next-buffer)
(global-set-key [(meta down)] 'other-window)
(defun other-window-back () 
  "cycle backwards through windows."
  (interactive)
(other-window -1))
(global-set-key [(meta up)] 'other-window-back)