vertical css child menu

hello i got a menu so i need to make child menu , but i cant can any one help me to make child menu ??

here is the link of menu:

http://www.dynamicdrive.com/style/cs...rey_side_menu/

please help me thanks

is it no one can do that :|


just tell me how i can,
i have tried
<ul>
<li>child</li>
</ul>
but its not working, its showing same like main menu

please help me :(

Something like this?