RE:Scripting for Buttons in Roll down menu!

Question

Hi!
I would like to know how to give scripting for Roll down menu?
For eg - Menu1 menu2 menu 3
s.menu1 s.menu1 s.menu1
s.menu2 s.menu2 s.menu2
s.menu3 s.menu3 s.menu3

When i click on Menu1 button the submenus should be displayed and also when i click on s.menu1 the color should change.
Next how to give links to s.menus??

Only the main buttons should be shown and when clicked on the corresponding menu the submenu should rolldown.

Pls tell me how it can be done with simple scripts?

Thank you,