Roll over dropdown dHTML menu

Do you know how to make a DHTML dropdown menu without javascript? What I want to do is to show/hide additional options onmouseover/onmouseout the main option.

Example.
My screen should look like this:
Discography

Then, when mouse is over Discography, the albums should be displayed:
Discography
Live from Downstairs
Rocking your garage
Rock is in the air

Or, in few words, what I want is the effect they have on this site on the top menu, when you put the mouse over "Tutorials" or "Forums". Thanks.

Here they have a kind of complex system using excessive margins and then they change it on hover. On my example we use the same basis (nested classes) but instead of changing the margin we're only going to use the display attribute.