Ah, the wonderful 'Pole Shift' theory. Some said the poles were supposed to 'flip' at the turn of the century, bringing about a new cycle of life on earth. Edgar Cayce made such predictions. For a 'slightly' less dubious source, you can check out Charles Hapgood publications. However, you will also have to endure his theories on the lost city of Atlantis. A related topic is the 'precession' of the earth - it's wobble on its axis that cataclism proponents use to explain how they think the centrifugal force of this wobble has caused the poles to flip (north becomes south). I couldn't find the animated example you are looking for. But there are a lot of sites that talk about the changing of the earth's magnetic field that have some good still images.