<html>
<head>
<title>背景滚动</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
</head>
<body background="1.gif">
<script language=JavaScript>
var c=-100000;
var numgc=document.body.sourceIndex;
function SF(){
c=c+1;
document.all(numgc).style.backgroundPosition= "0 " + c;
id=setTimeout("SF()",16);
}
SF();
</script>
</body>
</html>就是无法实现背景滚动，求解决途径
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