Horizontal navigation bar with horizontal sublinks

[DriftingSteps]

How do I make a navigation bar like the one on this site (http://www.kongregate.com/)?

There are firstly Main-links on a horizontal navigation bar, and when we rollover to one of the Main-links, a group of Sub-links appear right below the navigation bar on another horizontal bar.

How do I achieve such navigation bar?

Thanks,
Drift

[azoomer]

I think this one comes pretty close
http://www.dynamicdrive.com/style/csslibrary/item/jquery_drop_line_menu/

[DriftingSteps]

Hmm.... it really comes close, but what I want is exactly the one I showed in the example. I will work around with the codes of the jQuery example you have provided and see if I can come up with anything similar to what I want.
Thanks :)

[azoomer]

another suggestion
http://www.cssplay.co.uk/menus/simple_dropline.html
this may be even easier to adapt to look like the one you showed us.

[DriftingSteps]

Yes! Exactly what I wanted. Thank you very much for your help.