To view these pictures correctly, the "crossed eye" method must be used:

        -Sit about 18" from your monitor
        -Point a single finger at the bottom center of the double picture, about 7" from your nose.
        -Focusing on your finger, you should now see 3 (blurry) images on the screen.
        -Slowly drift your attention to the center picture, trying to bring it into focus while retaining the 3 pictures.

Note:  Some people have an easier time at this than others.  Be patient, and take breaks often to prevent making yourself dizzy!