DynarchMenu

Cross-browser and cross-platform DHTML menu, featuring keyboard shortcuts, CSS skins, unlimited menu depth, horizontal or vertical display, context menus, timeouts, cross-frames support and more! The menu is defined in plain (semantic) HTML as nested lists, as opposed to pure JavaScript setup that is used in most menus. This is friendly to search engines, has the advantage of being extremely easy to generate (even dynamically) and degrades even to non-JavaScript browsers.