<html>
<head>
<script>
function onLoad() {
window.onscroll = function() {
var speed = 8.0;
document.body.style.backgroundPosition = (-window.scrollX / speed) + "px " + (-window.scrollY / speed) + "px";
}
}
</script>
</head>
<body onload="onLoad()">
</body>
</html>