how to change PHP include ("link.html") by click buttons.
<?php include('link1.html')?>
BUTTON 1 change <?php include('link1.html')?> to <?php include('link2.html')?>
BUTTON 2 change <?php include('link1.html')?> to <?php include('link3.html')?>
BUTTON 3 change <?php include('link1.html')?> to <?php include('link4.html')?>
how to do this without refreshing page. using ajax?