There are two different types of popups that you can make with overLIB. The first type is when the popup goes away after you move your mouse away from a link or other object. The other type 'sticks' around afterwards. We call these "sticky" links. See the difference here and here.

This link uses an onClick event: Click here!

This link uses an onMouseOver event: Caption Example

Create menus!: Wikidot Links