Modifying Styles
http://developer.apple.com/internet/webcontent/styles.html

Apple Inc.
2006

Abstract:

With the release of W3 compliant browsers however, we now have the ability to change styles on the fly from JavaScript, using the W3C DOM. Unfortunately, due to a distinction between the way that embedded and remote stylesheet properties are exposed as opposed to the way that inline STYLE properties are exposed, this can be tricky.