Most webdesigner use different styles for navigation points with and without children. In portals you can often find a navigation with toggle function to expand or hide sub-navigation points. In the function "Navigation" it would be nice to have a method on the #nav object that returns if a navigation point has in navigation and/or sitemap shown children. The result could be a boolean or the number of visible children. This method could replace the call of complex scripts inside the function "Navigation".