GIFT is a jQuery plugin to use tiled image as animations. It is useful whereever a PNG is better than a GIF. Using this plugin enables you to take advantage of PNGs for true-color RGBA animations.
On unix-like systems, you can use Imagemagick or Graphicsmagick package to generate the tiled image out of your frames or MNG animation:
montage -background Transparent -tile 20x1 -geometry 48x48+0+0 00*png spinner.png
where -tile specifies how you want the images tiled, in our case we want the image to be a single row of images. -geometry specifies the size of the individual frame and the amount of margin around it, 0px in our case.