Ajax得到xml中的数据永远的object,该如何解决 _Ajax

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
HTML code

<%@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>