[Superfish] Top menu image sprites, 2nd level not displaying

[Baudesign]

Hi everyone,

I am trying to build a nice menu with Superfish JQuery script where my
top level is made with images, but where the second, third, etc. are
displayed simply with text titles.

For the moment, I am stuck:
http://www.mulibwanji.com/ma/?page_id=9

"Hi-Fi Set-Up" is the only page with submenus, for testing purposes.
If you put your curor over this tab and wait half a second, the other
tab appears, which is fine. It overlaps the main level. I just can't
get this second level to display below, with full size tab.

Here is the complete CSS code at the present moment:
http://www.mulibwanji.com/ma/wp-content/themes/ma/style.css

If someone could guide me a bit, I am going crazy pulling my hair off.

Thanks

Pat