我编写的JS程序怎么不能调用啊 ！请帮我看看了！ 急急急！！！ 原码如下：

fby.js代码：
document.write('<div id=demo style="overflow:hidden; width:90px; height:120px;">
<div id=demo1>
<img src="images/10.jpg"><br>
<img src="images/8.jpg"><br>
<img src=""><br>
<img src=""><br>
<img src=""><br>
<img src=""><br>
</div>
<div id=demo2></div>
</div>
<script language="javascript">
var speed=30
demo2.innerHTML=demo1.innerHTML
function Marquee(){
if(demo2.offsetTop-demo.scrollTop<=0)
demo.scrollTop-=demo1.offsetHeight
else{
demo.scrollTop++
}
}
var MyMar=setInterval(Marquee,speed)
demo.onmouseover=function() {clearInterval(MyMar)}
demo.onmouseout=function() {MyMar=setInterval(Marquee,speed)}
</script>');
1.html调用文件
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>新建网页 1</title>
</head>
<body>
<script language="javascript" src="fby.js"></script>
</body>
</html>