Many people like to create their own version of button inside their page.
Here is a little script to make it all work.
BACK Button
<form>
<input type="button" value="BACK" onClick="history.back()">
</form>
FORWARD Button
<form>
<input type="button" value="FORWARD" onClick="history.forward()">
</form>
Any Button
<form>
<input type="button" value="JavaScript Homepage" onClick="window.location='index.html'">
</form>
onClick is the event that invoke Java Script upon clicking.