window.returnValue 获得值为空

<%@ page contentType="text/html;charset=GBK" language="java"%>
<script type='text/javascript' src='/js/prototype-1.6.1.js'></script>
<script type='text/javascript' src='/js/commonjs.js'></script>
<script type='text/javascript' src='/js/validator.js'></script>
<script type='text/javascript' src='/dwr/engine.js'></script>
<script type='text/javascript' src='/dwr/util.js'></script>
<script type='text/javascript' src='/dwr/interface/houseAction.js'></script>
<%@ include file='/jsp/common/allTag.jsp'%>
<link rel="stylesheet" href="<%=request.getContextPath()%>/css/cb2.css" type="text/css">
<link rel="stylesheet" href="<%=request.getContextPath()%>/js/tab/webfx.css" type="text/css">
<link rel="stylesheet" href="<%=request.getContextPath()%>/css/cb2.css" type="text/css">
<link rel="stylesheet" href="<%=request.getContextPath()%>/css/main.css" type="text/css">
<link rel="stylesheet" href="<%=request.getContextPath()%>/css/imgurl.css" type="text/css">
<link rel="stylesheet" href="/js/tab-view/css/tab-view.css" type="text/css" media="screen">
<script type="text/javascript" src="/js/tab-view/js/ajax.js"></script>
<script type="text/javascript" src="/js/tab-view/js/tab-view.js"></script>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GBK" />
<title></title>
</head>
<script>
DWREngine.setErrorHandler(handler);
 function handler(errors) {
        alert(errors);
        enableForm("objectActionForm");
        return false;
    }
</script>
<body>
  <DIV id="queryResultList" style="PADDING-RIGHT:0px;"></DIV>
</body>
<script type="text/javascript">
var obj = window.dialogArguments;
toLoadHouseData();
function toLoadHouseData(){
 houseAction.toLoadHouseData1(obj,loadDataBack);
 disableForm();
}
function loadDataBack(data) {
  enableForm();
$('queryResultList').innerHTML = data; 
alert('test3');
alert('data: '+data);       
} /***保存***/
    function doSave() {
     var i = getCheckedRadiosCount('checkid');
     if(i==0){
     alert('请选择!');
     return false;
     }
        var houseId = getRadiosValue('checkid')
     houseAction.toLoadHouseData('2',houseId,callBackDoSave);
     alert('test4');
     alert('houseId: '+houseId);
    }
    function callBackDoSave(obj) {
window.returnValue = obj;
alert('test5');
alert('obj:  '+obj);//空值
window.close();
    }
       
    function doCancel(){ 
     window.returnValue = null;
     window.close();
    }
    
</script>
</html>