The technique used by FrontPage for a hover button is to use a Java applet.  When the user mouses over the button, it can change color in various ways, play a sound, or display a picture.  This is inserted into the page in Front Page 2002 by using Insert>Web Component>Dynamic Effects>Hover button.  An example is shown below.

Revised: June 2, 2003. Comments to William Pegram, wpegram@nvcc.edu