a script to support animated skins on Jstris
■ Press "b" to toggle on and off. To change toggle button, go to Settings → Controls → Toggle Animation.
■ To change Animation speed, go to Settings → Game settings → Animation speed. Animation speed is the length, in milliseconds, that each skin is displayed on the screen before moving sequentially to the next one. Raise the number to get a slower animation, and lower the number to get a faster one.
■ Change the skins you want in your animation by changing the URLs in the script. Add or subtract as many as you like. *Side effect of adding many skins is that it may cause initial lag before animation appears.
