Changing a CSS rule-set from Javascript

Question

Is it possible to make changes to a CSS rule-set dynamically (i.e. some JS which would change a CSS rule-set when the user clicks a widget)

This particular CSS rule-

Answer 1

The APIs for editing stylesheets with JS are, sadly, not consistent across browsers. The YUI Stylesheet Utility attempts to smooth over these differences so you could just use that. You could also look at the source code to figure out how it works if you don't want to use YUI itself.