Make command use specific functions for button action

[Heime]

I have this function that displays two buttons, and calls the
corresponding functions lsk1g and lsk1d.  I would really like to have
the capability to instruct mondu to use specific function names
rather than the hardwired lsk1g and lsk1d.

For instance I want to make a call to mondu that will use lsk2g and
lsk2d rather than lsk1g and lsk1d.

(defun mondu ( monbf )

  (with-current-buffer (get-buffer-create monbf)

    (insert " DU \n\n")

    (insert " ")
    (insert-button "[-]" 'action 'lsk1g)
    (insert " lsk1g   ")

    (insert-button "[-]" 'action 'lsk1d)
    (insert " lsk1d  ") )

  (pop-to-buffer monbf) )