dhtmlxMenu - Cross-Browser JavaScript Menu
dhtmlxMenu provides a simple Ajax-based navigation solution for web sites and applications. It allows developers to create attractive drop down menus within minutes. dhtmlxMenu can load its content from XML so it can be easily changed without reloading. The menu offers cross-browser/multiplatform compatibility, powerful client-side API, and customizable icons (with JavaScript or XML). It supports vertical scrolling of items, context menu view, and different button types.