This excerpt taken from the OMX 10-K filed Mar 16, 2005.
Section 34. In the absence of the president, or in the event of his inability to act, the vice presidents (or if there be more than one, the executive vice president, senior vice presidents, or the vice presidents in the order designated, or in the absence of any designation then in the order of their election or in the order named for election) shall perform the duties of the president and when so acting shall have all the powers of, and be subject
to all the restrictions upon, the president. Each vice president shall perform such other duties as from time to time may be assigned to him by the chairman of the board, the president, or the board of directors.