<script>

    var p1= document.getElementById('p1'),

  p2= document.getElementById('p2'),

div1= document.getElementById('div1');

p1.innerHTML = p2.innerHTML;

  function scrollUp(){

if(div1.scrollTop >= p1.offsetHeight){

  div1.scrollTop=0;

}else{

  div1.scrollTop++;

}

}

 var time = 50;

var myScroll = setInterval('scrollUp()',time);

</script>