Another variant of drop-down navigation is a tree which works a bit like a file explorer. There are plenty of jQuery plugins for this job around as well, but this time we're going to create everything from scratch. Thanks to jQuery, this is going to take neither a lot of time nor a lot of lines of code.

To keep the example as simple as possible, we're not using any pictures at all. You can surely find a way to improve the layout once you've had a closer look at the jQuery code.