Ajax得到xml中的数据永远的object

我是想用Ajax来模拟一下百度的自动提示的功能，有两个页面一个是请求页 一个是返回xml文件的页 但是用请求页返回的时侯总是object 不知道怎么回事啊

<%@page contentType="text/html;charset=gbk"%>

<%@page import ="org.dom4j.*"%>



<head>

	<title>测试代码</title>





	<!--这里是Ajax的地方-->

	<script type="text/javascript">

			var xmlHttp;

			var completeDiv;

			var inputField;

			var nameTable;

			var nameTableBody;

			var inputField;

			

			

			function createXMLHttpRequest(){//创建xmlhttp

				xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");

			}



			

			function initVars(){//初始化成员变量

				inputField=document.getElementById("names");

				nameTable=document.getElementById("name_table");

				completeDiv=document.getElementById("popup");

				nameTableBody=document.getElementById("name_table_body");

			

			}





			function findNames(){//发送请求

				initVars();

				if(inputField.value.length>0){

					createXMLHttpRequest();

					var url="test12.jsp?names="+escape(inputField.value);

					xmlHttp.open("get",url,true);

					xmlHttp.onreadystatechange=callback;xmlHttp.send(null);

				}

				else{

					clearNames();

				}

			}







			function clearNames(){//清除信息

				var ind=nameTableBody.childNodes.length;

				for(var i=ind-1;i>=0;i--){

					nameTableBody.removeChild(nameTableBody.childNodes[i]);

				}	

				completeDiv.style.border="none";

			}







			function callback(){

				if(xmlHttp.readyState==4)

					if(xmlHttp.status==200){

					var name=xmlHttp.responseXML.getElementsByTagName("name");

					//var name=xmlHttp.responseText;

					alert(name);

					setNames(name);

					

				}else if(xmlHttp.status==204){

					clearNames();

				}

			}





			function setNames(the_names)

			{

				clearNames();

				var size=the_names.length;

				setOffsets();

				var row,cell,txtNode;

				for(var i=0;i<size&&i<10;i++){//如果超过十条记录只显示十条

					var nextNode=the_names[i].firstChild.data;

					row=document.createElement("tr");

					cell=document.createElement("td");

					cell.onmouseout=function(){this.className='mouseOver';};

					cell.onmouseover=function(){this.className='mouseOut';};

					cell.setAttribute("bgcolor","#fffafa");

					cell.setAttribute("border","0");

					cell.onclick=function(){

						populateName(this);

					}

					txtNode=document.createTextNode(nextNode);

					cell.appendChild(txtNode);

					row.appendChild(cell);

					nameTableBody.appendChild(row);

					

				}

				alert(nameTableBody);

			}





			function setOffsets(){

				var end=inputField.offsetWidth;

				var left=calculateOffsetLeft(inputField);

				var top=calculateOffsetTop(inputField)+inputField.offsetHeight;

				completeDiv.style.border="black 1px solid";

				completeDiv.style.left=left+"px";

				completeDiv.style.top=top+"px";

				nameTable.style.width=end+"px";

			}







			function calculateOffsetLeft(field){

				return calculateOffset(field,"offsetLeft");

			}





			function calculateOffsetTop(field){

				return calculateOffset(field,"offsetTop");

			}





			function calculateOffset(field,attr){

				var offset=0;

				while(field){

					offset+=field[attr];

					field=field.offsetParent;

				}

				return offset;

			}

		





			function populateName(cell){

				inputField.value=cell.firstChild.nodeValue;

				clearNames();

			}

</script>







	<!--这里是css代码-->

	<style text/css>

		.mouseOut{

		background:#708090;

		color:#fffafa;

		}

		.mouseOver{

			background:#fffafa;

			coor:#000000;

		}

	</style>

</head>







 

<body>

	<h1>Ajax自动提示功能</h1>

	名称：<input type="text" size="20" id="names"  onkeyup="findNames();" style="height:20" />

	<div style="position:absolute" id="popup">

		<table id="name_table" bgcolor="#fffafa" border="0" cellpadding="0">

		<tbody id="name_table_body"></tbody>

	</div>

</body>

另外一个页面是这样的

<%

	response.setHeader("content-Type","text/xml");

	response.setHeader("Pragma","No-cache");

	response.setHeader("Cache-Control","no-cache");

	response.setDateHeader("Expires", -10);



%>

<html>

	<head>

		<title>测试页面</title>

	</head>

	<body>

		<%

			//String name=request.getParameter("names");

			String name="a";

			if(name.equals("a")){

				String data="<response><name>abc</name><name>ajax</name><name>apple</name><name>an</name></response>";

				out.println(data);

			}

			else if(name.equals('j'))

			{

				String data="<response><name>java</name><name>jsp</name><name>javascript</name><name>jar</name></response>";

				out.println(data);

			}

		%>



	</body>



</html>

大家帮我啊~~跪求~~