var box=document.getElementById("moocBox");
 var con1=document.getElementById('con1');
 var con2=document.getElementById("con2");
 con2.innerHTML=con1.innerHTML;
 box.scrollTop=0;
 function scro(){
  if(box.scrollTop>=con1.scrollHeight){
   box.scrollTop=0;
   
  }
  else{
   box.scrollTop++;
  }
 }
 var  timer =setInterval("scro()",50);
 box.onmouseover=function(){
  clearInterval(timer);
 }
 box.onmouseout=function(){
  timer=setInterval("scro()",50);
 }