About rollovers and states

A rollover is a Web effect in which different states of an image appear when a viewer performs a mouse action--such as rolling or clicking--over an area of the Web page. A state is defined by a specific configuration of the Layers palette, including layer location, styles, and other formatting options.

By default, every image has one state--the Normal state. The Normal state corresponds to the appearance of an image when it is first loaded into a Web browser and no rollover effects have occurred. You can add states to an image that will occur when a viewer performs a mouse action--such as rolling or clicking--over an area of the Web page.