var howQuick = 2000;
var beIE = document.all?true:false;
var iWhere = 0;
function scrollBackGround()
{
  if (beIE)	{
     			iWhere = iWhere + 3;
     			if (iWhere > 1000) iWhere = 1;
     			document.body.style.backgroundPosition = "0 " + iWhere;
     			window.setTimeout("scrollBackGround()",howQuick);
  		}
}
scrollBackGround();