Rollovers are a special type of button used on web pages. They change appearance (state) if you select them, click them, or if the mouse is over them (if the browser is JavaScript-enabled). This is controlled by a section of JavaScript on the web page. Xara LX creates this JavaScript when you Export the rollover buttons.
Rollovers have four possible states:
MouseOver - highlights the button when the mouse is over it.
MouseDown - applies when you click the button. Some early JavaScript-enabled browsers such as Internet Explorer 3 ignore this state..
Selected (pressed in) - shows that the button is selected.
MouseOff (pressed out) - when none of the previous states apply.
You can create rollover buttons with any combination of the four states. (Xara LX always creates the MouseOff button.)
For more information see Creating Rollovers.