se fai una ricerca sul forum lo trovi.


http://www.html.it/dynamic/menu/index.html
http://www.udm4.com/menu/demos/

oppure si riesce a realizzarlo con i css

http://www.alistapart.com/articles/horizdropdowns/
http://www.stunicholls.myby.co.uk/menus/dropdown.html
http://www.htmldog.com/articles/suck...le/bones3.html