背景图片向下滚动

<script language="JavaScript">
<!-- Begin
var backgroundOffset = 0;
var bgObject = eval('document.body');
function scrollBG(maxSize) {
backgroundOffset = backgroundOffset + 1;
if (backgroundOffset > maxSize) backgroundOffset = 0;
bgObject.style.backgroundPosition = "0 " + backgroundOffset;}
var ScrollTimer = window.setInterval("scrollBG(307)", 64);
// End -->
</script>

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