var backgroundOffset = 0;
var bgObject = eval('document.body');

function scrollBG(maxSize) {
  backgroundOffset = backgroundOffset + 1;
  if (backgroundOffset > maxSize) backgroundOffset = 0;
  if (document.all||document.getElementById) bgObject.style.backgroundPosition =  backgroundOffset + " 0";
  }

var ScrollTimer = window.setInterval("scrollBG(895)", 100);