This page background is rather nice as you should still be able to read the smaller text below. However, there is something unusual about this one compared to the one on the left - scroll down and you might be able to see what I mean...

See that as you scroll down the background does not appear to move whereas when you scrolled down on the one on the left, the background moved with the text? Rather a nice effect, isn't it - and incredibly eash to do.