jquery ,多个radiobutton,动态取值

        function SetValue(timevalue) {
            var id = timevalue.id;
            alert($('label[for='+id+']').text());
        }

///////////////////////////////////////////////////////////////////////////////

            <td>
                <asp:RadioButton ID="rbtn1" runat="server" Text="07:30" GroupName="ReserveTime" onclick="SetValue(this);" />
            </td>
            <td>
                <asp:RadioButton ID="rbtn2" runat="server" Text="07:40" GroupName="ReserveTime" onclick="SetValue(this);" />
            </td>