<script>var rotate = false;
function setbackground(){
  window.setTimeout( "setbackground()", 5000);
  newImage = rotate ? 'url(//abs.twimg.com/b/front_page/v1/JP_ASIA_6.jpg)' : 'url(//abs.twimg.com/b/front_page/v1/JP_ASIA_2.jpg)';
  rotate = !rotate;
  document.getElementsByTagName('body')[0].style.backgroundImage = newImage;
}
setbackground();</script>
<style type="text/css">body{background-repeat:no-repeat;background-position-x:50%;transition:background 1s ease;}</style>

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