I found a website that has a really cool effect for their links. The link is an image, and when you hover over it, it plays an animation, and after looking into it more, it seems that they use a single image with all of the different frames for the animation lined up, and they use this image as a background image and position it at one end. When you hover over it, they have the background image move from the position where the first frame is visible, to a position when the last frame is visible. Now, that only part I don't understand, is how they got it to actually go through the whole image to allow you to see all of the frames, rather than just jumping to the last frame.
I'm sorry if that makes very little sense, I can provide a link to the site if needed. I've looked all over and cannot find anything about this. I did find a lot about moving an image on hover, to show a different image, but nothing about slowing the process down.
Any help would be great.