Jquery calender as a dropdown in asp.net

Jquery calender as a dropdown to select month and year  in asp.net

 In .aspx page In head section

<script src="http://ajax.microsoft.com/ajax/jQuery/jquery-1.4.2.min.js" type="text/javascript"></script>
  <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.6/jquery.min.js" type = "text/javascript"></script>
<script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/jquery-ui.min.js" type = "text/javascript"></script>
<link href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/themes/base/jquery-ui.css" rel = "Stylesheet" type="text/css" />


    <script type ="text/javascript">

        $(function () {
            $("#txtDateOfBirth").datepicker({
                dateFormat: 'mm/dd/yy',
                changeMonth: true,
                changeYear: true,
                yearRange: '-100y:c+nn',
                maxDate: '-1d'
            });
        });
</script>



In body section --

   <asp:TextBox ID="   <asp:TextBox ID="txtDateOfBirth"   runat="server"
                             ></asp:TextBox>
                          "   runat="server"
                             ></asp:TextBox>