CSS Library: Here
CSS Spotlight Menu
Author: Dynamic Drive
Spotlight Menu takes advantage of CSS3's
border-radius property and
transitions to add a circular background to its menu items when the mouse rolls over each one. The result is a Flash-like, sleek spotlight menu! The circular background appears in all major browsers, including IE9, while the transition effect works in browsers that support CSS3 transitions, namely, FF3.5+, Safari 3.1+, Google Chrome, and Opera 11.6+.