<html>
<head>
<title>JS实现的往下不断流动的网页背景</title>
</head>
<body background="/images/bg002.jpg">
<script language="JavaScript">
<!-- Begin
var backgroundOffset = 0; //背景图片的偏移量
var bgObject = eval('document.body'); //得到文挡本身的对象
function scrollBG(maxSize) { //这个函数就是滚动背景的核心
backgroundOffset = backgroundOffset + 1; //将背景偏移加1点
if (backgroundOffset > maxSize) backgroundOffset = 0; //如果偏移量超过了最大值则回零
bgObject.style.backgroundPosition = "0 " + backgroundOffset; //设定背景的偏移量，使其生效
}
var ScrollTimer = window.setInterval("scrollBG(307)", 64); //设定每次移动背景之间的间隔。
// End -->
</script>
<div style="position: absolute; top: 200; left:300;">
<table border="0" width="100%" cellspacing="0" cellpadding="0">
<tr>
<td width="100%"><b>流动的背景是不是很漂亮？</b></td>
</tr>
</table>
</div>
</body>
</html>