I need to create a horizontal menu in CSS, for which I know how to do but on one of the menu items there are some further sub-menu items which I'd like to go on a line underneath so it shows when you rollover the main menu item and sticks when you're in that section.

I've hunted around a bit but can't seem to find anything - this type of menu probably has a name which I don't know. When I search for horizontal menu with sub menu I just get a load whereby the dub menu appears in a vertical list under the main menu item.

Any help would be very much appreciated.