Superfish is an enhanced Suckerfish-style menu jQuery plugin that takes an existing pure CSS drop-down menu (so it degrades gracefully without JavaScript) and adds the some nice features as well. The reveal of sub-menu is animated, uses a fade-in by default but can be given a custom object to be used in the first argument of the animate function. The animation speed is also customisable but is set to “normal” by default.

There is a set of callback functions (onInit, onBeforeShow, onShow and onHide) available as well, allowing for further enhancements and functionality to be added without needing to alter the core Superfish code.

Requirements: jQuery v1.1.3.1+
Demo: http://users.tpg.com.au/j_birch/plugins/superfish/
License: MIT and GPL License