var width = 6;
var direction = 1;

function scroll()
{
  var elem = document.getElementById('imagescroll');
  if(elem)
  {
    var left = getPosition(elem);
    if(left-1024<-getObjectWidth(elem) || left>=0)
    {
      direction = direction * -1
    }
    elem.style.left = left + (width*direction) + 'px';
    setTimeout('scroll()',250);
  }
}

function getPosition(element)
{
	var tleft = parseInt(element.style.left);
	if (isNaN(tleft)) 
		tleft = 0;
	return tleft;
}

function getObjectWidth(obj) 
{
  var result = 0;
  return parseInt(obj.offsetWidth);
}

setTimeout('scroll()',250);