timing sanity check:关于子窗口向父窗口传值的问题？？？

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01.asp
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<table>
<% do while i<request("id") %>
<tr>
<td>
<input name="desc<%= i %>" type="text">
</td>
<td>
<input name="Submit" type="button" onclick="openChild()">
</td>
</tr>
<%loop %>
</table>
<script language="javascript">
<!--
function openChild(){

var l=<%=i%>
var k = window.showModalDialog("02.asp",window,"dialogWidth:335px;status:no;dialogHeight:300px");
document.getElementById("desc"+l").value = k;
}
//-->
</script>
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02.asp
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<script language=javascript>
<!--
//设置返回到父窗口的值
function retrunValue()
{
var s = document.getElementById("txt2").value;
window.returnValue=s;
window.close();
}
//-->
</script>
<input id="txt2" type="text"><input type ="button" onclick="retrunValue()">

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请高手指教，这个是哪里错了，我怎么不能传值呀？？？