(autoload 'folding-mode "folding" "Folding mode" t)

(add-hook 'folding-mode-hook
          (lambda ()
            (local-set-key [C-tab] 'folding-toggle-show-hide)))

(add-hook 'c-mode-hook
          (lambda ()
            (folding-mode)))
(add-hook 'emacs-lisp-mode-hook
          (lambda ()
            (folding-mode)))