Highlighting Buttons on MouseOver

I would like to know how I can highlight a button when you place the mouse over it (similar to how Netscape Communicator or Internet Explorer does it).  Some source code would be appreciated.  Thanks.
YodaAsked:
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mgkCommented:
That's pretty easy - use the mouse events to trigger the use of a new image. I've left some stuff out of this applet but you should get the hang of it from this;

Boolean  on;
Image    onimage,offimage;

public void init() {
onimage=getImage(getCodeBase(),"onimage.gif");
offimage=getImage(getCodeBase(),"offimage.gif");
}

public synchronized void paint(Graphics g) {
   if (on) g.drawImage ( onimage, 0, 0, this );
   if (!on) g.drawImage ( offimage, 0, 0, this );
}
 
public boolean mouseEnter(Event e, int x, int y)  {
   on=true;
   repaint();
   return true;
}  
      
public boolean mouseExit(Event e, int x, int y)  {
   on=false;
   repaint();
   return true;
}  

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