In order to make your own, you do need to take a lot of images and put them together (hence the animation). Adobe Flash can do this, and I'm sure some other programs exist as well (perhaps even some free online options).
But yeah, when it's all packaged, the whole animation is just one (lower quality) image.
^happy birthday [:)]
He didn't finish it because after v15 I didn't check V16. Track is now open with V16. But do know I did a quick fly through on v16 in the editor to see if anything was changed, I just didn't ride it in the sim. Also, because I deleted V17, while cleaning my desktop.