WebDDM
WebDDM lets you customize your drop down menus in every way imaginable, using simple CSS and HTML. It's Javascript-only, so it's extremely fast and extemely small. At the same time, it's extremely powerful: for example, it allows you to have an unlimited number menus on any page, with unlimited menu nesting. It supports context menus of all sorts. It has a flexible and very precise positioning system that makes designing AND changing menus simple and fast. WebDDM sports a powerful styling system; in just minutes you can make your menus look like whatever you want! Furthermore, WebDDM menus feel like a part of your website and will make your visitors' experience more pleasant. And all for one low cost: $0.