Check this out! If you have a browser that groks CSS then you see a background image that doesn't scroll.
That's part of css/edge, a site that attempts to push the limits of CSS. Very nice, but if you read carefully you'll see that Mozilla's about the only browser that supports it. And until AOL ships it, Mozilla is bugger all of your audience.
--Nat
Fixed positioning is an old trick (used by the W3C on their own specs) but the rest of the site has some quite amazing tricks (notably the text that follows the outline of complex graphics). Also note that on some of those pages you can use alternate stylesheets (in Moz: View -> Use Stylesheet and pick the name of the one that you want -- yes, Mozilla and its respect of standards rocks like that
Fixed positionning can also be used for very cool stuff, such as for instance having any part of a page stay where it is when one scrolls, which is useful to avoid frames.
