If "Main menu" is selected in theme settings 0 Point will display a static menu. To activate the drop-down menu put the <a href="?q=/admin/structure/block/manage/system/main-menu/configure">Main menu block</a> in the "Drop Down menu" region and set the correct levels to "expanded" (the parent item). <br /> NOTE: Only the static menu can be properly centered. <br /> NOTE for RTL sites: IE6 will accept only left positioned Drop-Down menu.