CSS Library: Horizontal CSS Menus: Here
Sleek Pointer Menu
Author: Dynamic Drive
An inverted, round corner CSS menu bar with a cut-out pointer below each menu link. The pointer is simply a transparent background image, automatically adopting to any background colors (in this case, black and darkred). Furthermore, you can easily "deconstruct" this menu depending on the desired look, such as removing the top border or the two round corners. Enjoy!
The three images used (last image resized for easier download):