This menu turns a nested UL list into a horizontal drop line tabs menu. The top level tabs are rounded on each side thanks to the use of two transparent background images, while the sub ULs each appear as a single row of links that drop down when the mouse rolls over its parent LI. The menu also manages to sneak in a little CSS3, making use of the "border-radius" property to give each link within the sub ULs rounded edges when the mouse hovers over them..