Simple Menu is a quick jQuery plugin which aims to be simple, minimally invasive, and provide non complicated, rudimentary functionality without bells and whistles. It is the very script used in this site to provide multilevel drop down menus.

Simple the options are the bare minimum necessary to adapt to the simplicity of needs, you may specify what type of trigger is used (click or hover) and specify callbacks to fire when displaying a menu or hiding a menu. That’s it. The rest of the styling is left up to you, however you decide to do it.

See the code