Vertical Sliding Menu

I need a menu that slides open to reveal the subcategories. See the attatched picture and you will understand. So if i click on Menu 2 then Menu 1 will close. and Menu 2 will expand to reveal its links. and so on and so forth. I need this to be done in either DHTML or javascript NOT IN FLASH! This menu has to be crossbrowser and involve no plugins. The code should be commentated ESPECIALLY the editable regions should be well defined, so that I may add in other menu items and sublinks myself. The links in the menu should all setup to open within a target frame. ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Exclusive and complete copyrights to all work purchased. (No GPL, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site). ## Platform Crossbrowser Javascript DHTML CSS