a=0;
function scroller()
{
  if (document.body.scrollHeight-document.body.scrollTop==document.body.clientHeight)
  {
    a=1;
  }
  else if (document.body.scrollTop==0)
a=0;
	if(a==0)//yukarı kaydırma
	scroll(0,document.body.scrollTop+1);
	else//aşağı kaydırma
	scroll(0,document.body.scrollTop-1);
}
function runScroller()
{
scrollInterval = setInterval( "scroller()", 70);
}
runScroller()