There are many different ways of simplifying an interface, and one of the best is by means of using tabs. I've written a couple of tutorials on making tabbed interfaces with CSS. However, it would be even easier to just have a class that generates the tabs automatically. Well, this class can be used to generate a tab based Web interface.
The content is loaded from the server using AJAX to avoid page reloading.
The tab links may have a fallback URL that is used when loading the pages via AJAX is not possible.
Here's the link to the class: http://www.phpclasses.org/browse/package/3824.html