dhtmlxTree is a robust JavaScript UI component that allows you build Ajax-enabled navigation trees with Explorer-like functionality. Advanced features include rich script API, in-line node editing, drag-and-drop capabilities, built-in checkboxes, context menu, XML/Javascript/JSON/CSV support, special techniques for handling large trees with great number of nodes, and more. dhtmlxTree provides a ready-to-use solution for server-side integration and works in all main web browsers (IE, FF, Opera, Safari, Chrome).