If u're using frontpage its a piece of cake...Just go to Insert-> Interactive Buttons and choose from a variety of options. If u want to use your own image, then u'll have to use its inbuilt DHTML editor which will allow you to change what happens when a person:-
a) places the cursor over the button

clicks the button
U will have to define all the custom images yourself.
1. First enable the DHTML view toolbar in frontpage.
2. Then select the button and choose the option you require i.e. Mouse Hover, Mouse Click.
3. In actions choose the one that lets you change the image(Forgot exact name though) and specify the file(s).
If u still face any problems...then reply.
Hope i was helpful.
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