Vertically auto scroll from in gridview based on time span.

Solution:
set onload="pageScroll()" in body
function pageScroll() {
window.scrollBy(0,20); // horizontal and vertical scroll increments
scrolldelay = setTimeout('pageScroll()',2000);
if (document.body.scrollHeight ==
document.body.scrollTop +
window.innerHeight) {
window.scrollTo(0, 0);
//$(window).scrollTop();
}

}