I am trying to figure out how to create the illusion of perspective with layers in CSS. Basically, I have three layer images over each other (foreground, middle, and background) and they are all different widths. I want them to move (or appear to move) at different speeds as the user scrolls horizontally to make it appear as though the landscape is changing in perspective with their scrolling.

I felt like I had seen this done many times, but when it came to actually doing it I could find many resources/references. The closest thing I was able to find was the Overgrowth website: http://www.wolfire.com/overgrowth (click buttons at the top)

Any help or ideas to get me started off on the right foot would be great.

Thanks very much!