I know how to make sliding menus. That's not the problem.

I need to know how to make more than one level.

For example:

(this is an example menu)
Page 1
Page 2
Page 3

When you click on Page 1 you get
Page 1
One
Two
Three
Page 2
Page 3

But I need to know how to have something come after that like this
Page 1
One
Uno
Dos
Tres
Two
Three
Page 2
Page 3

I hope that's an understandable way of putting it.

I think the type of component you're looking for is called "Accordion". Just Google for "JavaScript accordion menu". I just found a nice jQuery-based one using those keywords.