.changePage() changes page, but reloads previous page for a second

gistfile1.html

<script>
$(document).ready(function(){
 $("#pageone").bind("swipeleft", function(event,ui){
  $.mobile.changePage($("#pagetwo"));
 })

 $("#pagetwo").bind("swiperight", function(event,ui){
  $.mobile.changePage($("#pageone"));
 })
});  
</script>

[...]

<div data-role="page" data-theme="b" id="pageone">
 <div data-role="content" id="content1">	
  FIRST PAGE 
 </div><!-- /content -->
</div><!-- /page -->

<div data-role="page" data-theme="b" id="pagetwo">
 <div data-role="content" id="content2">
  SECOND PAGE
 </div><!-- /content -->
</div><!-- /page -->