1.  Quorum fixed by bylaws.  A majority of the number of directors fixed by the bylaws, or in the absence of a bylaw fixing the number of directors, then of the number stated in the articles of incorporation, shall constitute a quorum for the transaction of business, unless otherwise provided in the articles of incorporation or the bylaws, but in no event shall a quorum consist of less than 1/5 of the number of directors so fixed or stated. The act of the majority of the directors present at a meeting at which a quorum is present shall be the act of the board of directors, unless the act of a greater number is required by this Act, the articles of incorporation or the bylaws.  

2.  Special meetings.  Special meetings of the directors may be called by the chairman of the board, the president, or if he is absent or is unable to act, by any vice-president, by any 2 directors, or by any other person or persons authorized by the bylaws.