Topic awaiting preservation: javascript framework?

hello

I am looking for a javascript / dhtml / ajax framework.

something that will allow me to:

1. create menus dynamically, such as:

var x = new Menu(); x.newMenuItem(new MenuItem('yadsad'));

etc...to build a complete menu structure ,as if programming the windows api.

2. create windows resizable, maximizable, closable dhtml windows

3. create a status bar object..

allows one to create a status bar, whose elements/columns are easily accessible.

4. allows loading of external html files into a given dhtml window

5. ajax libraries in that framework

etc....

anyone knows such a javascript framework?

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Regards,
Elias

http://script.aculo.us/ has some nice ajax and dhtml librarys but no menu, no windows, no status bar ;-).
But it might be a good start.