extjs helloword不显示

<!--helloword.jsp-->
<html>
<head>
<title>Customizing the Grid</title>

    <link rel="stylesheet" type="text/css" href="../extjs/resources/css/ext-all.css" />
 	<script type="text/javascript" src="../extjs/ext-base.js"></script>
    <script type="text/javascript" src="../extjs/ext-all.js"></script>
    
    <script type="text/javascript" src="../js/table.js"></script>
    <script type="text/javascript" src="../js/hellword.js"></script>   
</head>

<body>

</body>
</html>
--------------------------------
<!--hellword.js-->
Ext.onReady( function(){
	
	Ext.MessageBox.alert("hello word extjs!!!");
		
});

extjs

extjs helloword

参考:
ExtJs"入门"

http://extjs.org.cn/index.php?q=node/83