查错!!请看这段代码中有什么错误吗?

<html>
<body>
<script language="javascript">
<!--
var num=new Array (1,2,3,4,5,6,7,8,9);
document.write("<p><h3>乘法口诀表</h3></p>");
document.write("<table border=0 cellspacing=0 cellpadding=5>");
for(var num1=1;num1<=9;num1++) { 
document.write("<tr>");
for(var num2=1;num2<=num1;num2++)
document.write("<td>"+num[num2-1]+"*"+num[num1-1]+"="+num[num1-1]*num[num2-1]+"</td>");
document.write("</tr>");
}
document.write("</table>");
-->
</script>
</body>
</html>