我的程序那里错了
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Untitled</title>
<script language="JavaScript">
<!--
Message="欢迎光临流星小站"
MesLen=Message.length
Alpha=5
I_Alpha=0.05
HtmlSentence=""
for(x=0;x<MesLen;x++)
{
HtmlSentence=HtmlSentence+"<DIV id=L"+x;
HtmlSentence+="STYLE="
HtmlSentence+="'width:3;font-family:Courier New;font-weight:bold;position:absolute;top:40;left:50;z-index:0'>"
HtmlSentence+=Message.charAt(x)+"</DIV>"
}
document.write(HtmlSentence);
Time=window.setInterval("roll()",10);
Alpha=5
I_Alpht=0.05;
function roll()
{
Alpha=Alpha-I_Alpha;
for(x=0;x<MesLen;x++)
{
Alpha1=Alpha+0.5*x;
Cosine=Math.cos(Alpha1);
Ob=eval("L"+x);
Ob.style.posLeft=100*Math.sin(Alpha1)+150;
Ob.style.zIndex=20*Cosine;
Ob.style.fontSize=40+25*Cosine;
Ob.style.color="rgb("+(27+Cosine*80+50)+","+(127+Cosine*80+50)+",0)";
}
}
//-->
</script>
</head>
<body>
</body>
</html>
我这个简单的程序那里有问题阿,
学习javascript都学些什么东西阿