I publicly admit that i love javascript and all the possibilities it offers, and of course one of them is to create an asynchronous scrolling effect, also known as Parallax.
This library is perfect to do it with little effort, since it comes standard with many things already prepared with which it will be really easy to create this famous and increasingly well-known effect.
It is also ideal for light websites, since does not depend on jQuery for its operation, which is a big plus for it.
Source | WebResourcesDepot