that is all you want it to be but a waterfall effect. you can clearly see a static image and some white particles going down there.
to the dudes that make these sitepoint articles : you should explain what all that script does instead of saying copy these 10 lines of code put them there, then put these other 5 elsewhere. i mean, the user doesnt understand a thing of that script(maybe). that's just my opinion, i find these sitepoint articles useless without any kind of explanation.