drop down menu

[Jay=B]

I will try and explain this the best way I can. I know there is a way to do this but I just don't know how. Using JavaScript I want to have a drop down menu display some content but when the user clicks a content then it gives you another list to select from and then you click that and your button and it takes you to that file.
For example
This would be a drop down
Numbers
1
2
3 - User clicks this and it takes you to numbers - 3 file.
Letters
A
B
C

Thanks in advance.

[Mark Sreeves]

Have a look on http://www.bratta.com there are one or two menus on there