菜鸟问EXTjs框架实例问题~~~

刚学EAT 看了篇文章　做了简单的例子
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>ExtJS</title>
<link rel="stylesheet" type="text/css" href="../resources/css/ext-all.css" />
<script type="text/javascript" src="../adapter/ext/ext-base.js"></script>
<script type="text/javascript" src="../ext-all.js"></script><script>
Ext.onReady(function(){
new Ext.Panel({
renderTo:"hello",
width:400,
height:200,
layout:"column",
items:[{columnWidth:.5,
title:"面板1"},
{columnWidth:.5,
title:"面板2"}]
});
});
</script></head>
<body></body>
按理应该有面板出来的，但是一点反应都没有