JSTree，为什么不显示东东呢？

代码如下：<%@ page language="java" import="java.util.*" pageEncoding="gbk"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://" + request.getServerName()
+ ":" + request.getServerPort() + path + "/";
%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>"> <title>Tree Demo</title>
<script type="text/javascript" src="js/jquery.js"></script>
<script type="text/javascript" src="js/jquery.jstree.js"></script>
<script type="text/javascript">
$(function (){
$("#demo1").jstree({
"xml_data" : {
"data" : ""+
"<root>" +
    "<item id='node_1'>" +
        "<content><name>Root node 1</name></content>" +
    "</item>" +
    "<item>" +
        "<content><name>Root node 2</name></content>" +
    "</item>" +
    "<item parent_id='node_1'>" +
        "<content><name>Child node</name></content>" +
    "</item>" +
"</root>"

},
"plugins" : ["themes","xml_data"]
});
});
</script>
</head> <body>
<div>
<h3>MyTree</h3>
</div>
<div id = "#demo1">
</div>
</body>
</html>
JQuery版本1.4.2
jsTree版本为1.0琢磨了好些时间了，高手们看看！