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From R & R Webworks:
The Janim applet is an applet which is capable of reflecting the animation created by rotating GIF or JPEG images. Its flexibility allows totally animated lake images, timed rotation of non-animated images, simple JPEG or GIF animation, slideshows or with the use of the 'notop' parameter, may be used in dual applet configurations. GIF overlays may be used and the applet may be configured to display still another non-animated image upon the click of a mouse.