Go to next/previous stereo image by clicking the right/left arrows at the bottom. Change wiggling speed by pressing SPACE. Wiggle stereo images are pairs of images taken by two slightly different perspectives. Alternating the two images creates in the viewer mind a stereo (3D) effect.
You can import new pairs of wiggle images into the wiggle sprite. Just google for "wiggle stereo images". Remember to change the "num of images" global var (in the wiggle sprite). This is a 2-years old project I had lost track of in my harddisk... :-)