How to automatically save files on lose focus in Emacs

Question

Is it possible to configure Emacs, so that it saves all files when the emacs window loses focus?

Answer 1

Not sure if this is what you want.

(defun dld-deselect-frame-hook ()
  (save-some-buffers 1))

(add-hook 'deselect-frame-hook 'dld-deselect-frame-hook)

From: http://www.dribin.org/dave/blog/archives/2003/09/10/emacs/

EDIT: It only seems to work in XEmacs