Ultimate Drop Down Menu: Accessible Javascript Menu 4.5 by Brothercake - List-based Semantic DHTML Menu. Javascript Tutorials - Collapsible/Expandable Menu. Son of Suckerfish Dropdowns. Single-level Dropdowns Right.
Let's not beat around the bush. The initial HTML we're dealing with will look something like this: <ul id="nav"><li><a href="#">Percoidei</a><ul><li><a href="#">Remoras</a></li><li><a href="#">Tilefishes</a></li><li><a href="#">Bluefishes</a></li><li><a href="#">Tigerfishes</a></li></ul></li><li><a href="#">Anabantoidei</a><ul><li><a href="#">Climbing perches</a></li><li><a href="#">Labyrinthfishes</a></li><li><a href="#">Kissing gouramis</a></li><li><a href="#">Pike-heads</a></li><li><a href="#">Giant gouramis</a></li></ul></li></ul>