object doesn't support this property or method

<head runat="server">
   <title>寝室管理</title>
   <LINK href="../css/style.css" type="text/css" rel="stylesheet">
<script>     function modify() {
        len = 0
        values = 0;
        var nums = parseInt(Form1.num.value);         if (nums == 1) {
            if (Form1.Id.checked == true) {                 len = 1
                values = Form1.Id.value;
            }
        }
        else {
            for (var i = 0; i < nums; i++) {
                if (Form1.Id[i].checked == true) {
                    len = 1
                    values = Form1.Id[i].value;
                }
            }
        }
        if (len == 0) {
            oks("请选择寝室！");
            return false;
        } else {
        window.location = "SelectBeder.aspx?Id=" + values;
        }
    }
 
</script>
</head>
<body bgColor="#ffffff" leftMargin="0" topMargin="0" >
<form id="Form1" method="post" runat="server">
<table id="Table11" cellSpacing="0" cellPadding="0" width="97%" align="center" border="0">
<tr>
<td vAlign="top" align="center">
<table height="440" cellSpacing="0" cellPadding="0" width="100%" border="0">
<tr>
<td vAlign="top">
<table cellSpacing="0" cellPadding="0" width="100%" border="0">
<tr>
<td vAlign="top">
<table cellSpacing="0" cellPadding="0" width="100%" border="0">
<tr>
<td height="10"></td>
</tr>
</table>
<table cellSpacing="0" cellPadding="0" width="100%" border="0">
<tr>
<td width="5"></td>
<td style="FONT-WEIGHT: bold; FONT-SIZE: 11pt; COLOR: highlight; TEXT-DECORATION: none"
bgColor="#d3d3d3">&nbsp;&nbsp;选择寝室</td>
</tr>
</table>
<div style=" OVERFLOW: auto; WIDTH: 100%; HEIGHT: 370px;" align="left">

<asp:datagrid id="Dg_Directory" runat="server" AutoGenerateColumns="False" Width="100%" HorizontalAlign="Left" AllowPaging="True" CssClass="listtitle" onItemDataBound="bind" CellPadding="1" CellSpacing="1" GridLines="None" BackColor="White" PageSize="10">
<HeaderStyle HorizontalAlign="Center" VerticalAlign="Middle" BackColor="LightGray"></HeaderStyle>
<ItemStyle CssClass="listtext"></ItemStyle>
                                <Columns>
                                    <asp:TemplateColumn>
                                        <ItemTemplate>
                                            <input type="radio" name="Id" value='<%# DataBinder.Eval(Container.DataItem,"Id")%>'>
                                        </ItemTemplate>
                                    </asp:TemplateColumn>
                                    <asp:BoundColumn SortExpression="Room" DataField="Room" HeaderText="寝室编号">
                                        <ItemStyle Wrap="False" HorizontalAlign="center"></ItemStyle>
                                    </asp:BoundColumn>
                                    <asp:BoundColumn SortExpression="Money" DataField="Money" HeaderText="费用（人/天）">
                                        <ItemStyle Wrap="False" HorizontalAlign="center"></ItemStyle>
                                    </asp:BoundColumn>
                                     <asp:BoundColumn SortExpression="Famleormale" DataField="Famleormale" HeaderText="属性">
                                        <ItemStyle Wrap="False" HorizontalAlign="center"></ItemStyle>
                                    </asp:BoundColumn>
                                </Columns>
                                <PagerStyle Visible="False"></PagerStyle>
                            </asp:DataGrid>
                            </div>

</td>
</tr>
</table>
 <input id="Hidden1" type="hidden" runat="server" />
                &nbsp;&nbsp;
                <cc1:PageControls ID="Page1" runat="server">
                </cc1:PageControls>
                <input id="sortfield" type="hidden" value="Room desc" name="sortfield" runat="server">
                <input id="sortval" type="hidden" name="sortval" runat="server">
                <input id="num" type="hidden" name="num" runat="server">
                <input type="hidden" name="Img">
                <input type="hidden" name="Messages">
                <input type="hidden" name="Button_Value">
</td>
</tr>
<tr>
<td vAlign="top" align="center">
<table id="Table15" style="WIDTH: 546px; HEIGHT: 50px" cellSpacing="0" cellPadding="0"
width="546" border="0">
<tr>
<td align="left" width="79%" height="39">&nbsp;
<TABLE id="Table13" cellSpacing="0" cellPadding="0" width="46%" bgColor="#999999" border="0">
<TR class="function" bgColor="#ffffff">
<TD><input value=" 确 认 " name="butt" type="button" onclick="modify()" class="input-button"></TD>
<TD><INPUT class="input-button" onclick="javascript:window.parent.close();" type="button" value=" 放 弃 ">
</TD>
<TD><FONT face="宋体"></FONT></TD>
</TR>
</TABLE>
</td>
<td align="right" width="21%"><FONT face="宋体"></FONT></td>
</tr>
<tr>
<td colSpan="3" height="10"></td>
</tr>
</table>
</td>
</tr>
</table>
</td>
</tr>
</table>

</form>
</body>
这个错误在141行根本就没有141，请大家帮帮忙帮我解决这问题  object doesn't support this property or method