JSON Object Loading Issue

Dear All,
I am tryig to load the tree using the JSON Object.But the tree is not visible i tested the same by keeping an alert then i came to know that it is visible until we close the alert.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"	"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<head>
<meta http-equiv="Content-type" content="text/html; charset=utf-8"></meta>
<title></title>
</head>

<link rel="stylesheet" type="text/css" href="codebase/dhtmlxtree.css"></link>
<script src="codebase/dhtmlxcommon.js"></script>
<script src="codebase/dhtmlxtree.js"></script>
<script src="codebase/ext/dhtmlxtree_start.js"></script>
<script src="codebase/ext/dhtmlxtree_json.js"></script>
<script src="codebase/ext/dhtmlxtree_ed.js"></script>
<script src="codebase/ext/dhtmlxtree_er.js"></script>

<link rel="stylesheet" href="codebase/dhtmlxscheduler.css"
	type="text/css" media="screen" title="no title" charset="utf-8"></link>
<link rel="stylesheet" href="codebase/ext/dhtmlxscheduler_ext.css"
	type="text/css" title="no title" charset="utf-8"></link>



<script type="text/javascript" charset="utf-8">
	var treeData = {
		id : 0,
		item : [ {
			id : 1,
			text : "first"
		}, {
			id : 2,
			text : "middle",
			child : "1",
			img0 : "book.gif",
			item : [ {
				id : "21",
				text : "child"
			}, {
				id : "22",
				text : "child"
			}, {
				id : "23",
				text : "child"
			} ]
		}, {
			id : 3,
			text : "last"
		} ]
	};

	function init() {

		initPhysicianList();

	}
	function initPhysicianList() {

		var tree = new dhtmlXTreeObject("doctor_tree", "100%", "100%", 0);
		tree.setImagePath("codebase/imgs/");
		tree.loadJSONObject(treeData);

		alert("Initializing Tree")

	}
</script>

<body onload="init();">

<div id="doctor_tree" setImagePath="codebase/imgs/csh_bluebooks/"
	class="dhtmlxTree"
	style="width: 250px; height: 180px; background-color: #f5f5f5; border: 1px solid Silver;"></div>

</body>

And even the attach event is also not working.

please do help me in resolving the issue

Thanks and Regards
Tirupathi Rao.P

You can not combine two approaches for tree initialization. You should use either html init or JS:

instead of

Thank you very much for your timely response.