The hyperlinks in most of our templates change in some manner (color, underline, no underline, overline, overline/underline, bold, etc.) when you roll your mouse (cursor) over the link. That's a textual rollover and it is controlled completely by the external style sheet.
Some of our templates contain image rollovers. That means that a button image changes in some way when the mouse (cursor) passes over it. This feature is controlled by either external CSS, Javascript or a combination of the two (DHTML) depending on the way the template was developed.
The term rollover is also referred to as a mouseover.
