CSS Library: Horizontal CSS Menus: Here
Sliding Doors Tabs Menu
Author: Dynamic Drive
This is a two state rollover tabs menu based on the popular sliding doors technique. It uses two images only, a right and left tab, with each image shifting up and down as the mouse moves over a tab. This ensures a flicker free experience in IE, though it also means the tab images themselves require a little more labor to create.
The "CSS" tab is highlighted, by giving its <li> container an ID of "current."
The two images: