<snip> I always use the CSS tab found at http://webfx.eae.net/dhtml/tabpane/tabpane.html Never gave me much problems. Completely customizable. </snip> Strange. His class hierarchy shows class-subclass-subsubclass (etc) : .dynamic-tab-pane-control .tab-page .dynamic-tab-pane-control .tab-page Anybody has ever used this kind of sub-classing? I never saw it in use before, is it even standard notation?