子視窗給父視窗賦值

[javascript] A頁面<script type="text/javascript">            function popUp(url) {              objSubWin = window.open(url, "Popup", "toolbar=no,scrollbars=no,location=no,statusbar=no,menubar=no,resizable=0,width=300,height=80");              objSubWin.focus();          }            function SetValue(val) {              var amount = document.getElementById('<% = TextBoxAmount.ClientID %>');           amount.value = val;       }        </script>  [csharp]  <asp:TextBox ID="TextBoxAmount" runat="server" Enabled="false"></asp:TextBox>              <asp:Button ID="Button1" runat="server" Text="Call child window" OnClientClick="popUp('PageB.aspx')" />   B頁面：<script type="text/javascript">        function isNumeric(keyCode) {            return ((keyCode >= 48 && keyCode <= 57) || keyCode == 8)        }         function calc() {            if (window.opener != null && !window.opener.closed) {                var qty = document.getElementById('<% = TextBoxqty.ClientID %>');                var price = document.getElementById('<% = TextBoxPrice.ClientID %>');                 window.opener.SetValue(parseInt(qty.value) * parseInt(price.value));            }        }    </script>數量<asp:TextBox ID="TextBoxqty" runat="server" onkeydown="return isNumeric(event.keyCode);" onpaste="return false;" Width="50"></asp:TextBox>            * 單價<asp:TextBox ID="TextBoxPrice" runat="server" onkeydown="return isNumeric(event.keyCode);" onpaste="return false;" Width="50"></asp:TextBox>            <asp:Button ID="Button1" runat="server" Text="Calculate" OnClientClick="calc()" />