父窗体打开一个子窗体是框架网页，怎样返回值，在线等

[XCL6996]

这是父窗体部份
<script language="JavaScript">
var msg;
function openwin(emp)
{
msg=emp;
window.open ("treeFrame.htm", "", "height=400, width=400, top=0 , toolbar=no, menubar=no, scrollbars=no, resizable=no, location=no, status=no");
}
</script>
这是框架网页的部份
<script language="javascript">
function PostIt()
{
if(window.opener.msg=="Receipt")
{
window.opener.document.all.TextBox_Receipt.value =document.all.TextBox_List.value;
}
window.close();
}
</script>

错误提示：window.opener.msg为空，或不是对象

[笨笨兔兔兔兔兔]

window.parent.opener??
try

[panshiwu]

window.top