How to modify the menu as a drop down menu?

[mobypod]

Hi everyone. I need to modidy my menu. I want to show the different video categories in the channel section (or other).
How can i do that?
I think that I must make modifications in Css (style.css) and in header.tpl
but i don't no how to do that. If someone have any idea, it will be great!

;-)

[mobypod]

ok nobody knows... No problem, i found the solution and it work. In fact it's simple :
you have to edit Style.css & header.tpl

follow this tutorial for know how to create list in html & insert css code...
CSS Express Pure CSS Drop-Down and Popup Menus by PVII
or this one:
Sexy Drop Down Menu w/ jQuery & CSS - Noupe