UvumiTools Dropdown Menu is a lightweight, unobtrusive, cross-browser, multilevel drop down menu powered by MooTools. Integrating it into your website is a breeze, and you can customize its entire look & feel with CSS.
UvumiTools Dropdown Menu script does not generate any new markup and only moves things around a bit. Menu structure and links are visible from the beginning; everything is accessible and easily indexed by search engines.
In additions to the main features, you also have the option to specify transition effects and speed. UvumiTools Dropdown Menu is available under MIT license. You can find further information, demo & download on UvumiTools Website.