JavaScript tree menu can be used to display hierarchical structure
of the site or any other structure.

JavaScript drop down menu is one
of the most commonly used controls on the web.

JavaScript Outlook bar menu is another
fancy way of the site navigation.

COOLjsBuilder is a standalone application for Windows PCs which allows you to implement JavaScript menu and tree based on COOLjsTree or COOLjsMenu scripts.

COOLjsTree Samples

Standard:

customizable images
unlimited levels
arbitrary content
per-level styles
runtime control
collapsible forms
sample navigation
sample site map
yet another sample

Professional:

SuperDemo!
relative positioning
advanced images
Explorer-style mode
large images
selected node (1)
selected node (2)
persistent state
text wrapping
dynamics
individual node properties
advanced styles
event handlers

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Tree state saving

COOLjsTree Professional allows you to save its state in browser's cookies. I.e. next time user will visit the page tree will restore it's previous state.

Try to reload page and you will see that trees keep they states.

To enable this feature you have to set field nr.17 in the format file to "true":

var TREE1_FORMAT = [
    ...
// 17. if true state will be saved in cookies
    true,
    ...
];