(function () { var parent = $('#list'); var child1 = document.getElementById('rowup'); var child2 = document.getElementById('rowupcope'); child2.innerHTML = child1.innerHTML; var i=0; setInterval(function () { if(parent.scrollTop() >= child1.scrollHeight) { i=0; parent.scrollTop(i); } else { i++; parent.scrollTop(i); } }, 60); })()