<html><body>
<div id="scrollable" style="overflow-y:scroll;height:500px">
  <div style="height:1000px;width:500px;">
    Scrollable content.
  </div>
</div>
<script type="text/javascript">
document.getElementById('scrollable').addEventListener('mousedown', 
    function(evt) { 
        evt.preventDefault(); 
    });
</script></body></html>