I have implemented pureDOMexplorer (pde) in the sidebar to clean up the navigation a bit. It sits upon a foundation of accessible, XHTML-compliant unordered lists and uses unobtrusive JavaScript to toggle the visibility of sub-categories. It was extremely easy to implement and saved me a ton of time. I really wasn’t looking forward to writing the script to perform this functionality. Onlinetools.org is a very handy JavaScript resource that I recommend you check out if you are developing a site.