Features:

many possibilities for configuration the appearance, e.g. in order to display a navigation like Microsoft Windows Explorer
sructure is generated by xml file on disk or xml data in memory
each node can have an individual image for normal state and for selected state
there can be a checkbox for each node
displays horizontal / vertical scrollbars if necessary
raises events for selecting and expanding a node
compatible with Microsoft Internet Explorer > 5.5, Opera > 6.0, Mozilla > 1.5, Netscape > 7.0.