define dynamic variable in javascript

<script>
function getTooltips() {
    $(document).ready(function () {

        var x = $.jQax(
    {
        LoaderContainerId:  "#" + "<%=divMyLoadingDiv2.ClientID %>";,
        LoaderText: "."
    });


        var datePicker = $('#' + '<%= JQDatePicker1.ClientID %>').val();
        var data1 = "{ myDate : '" + datePicker + "' }";

        x.Post("<%=getServicePath() %>", data1,
                    function (data1, eventArgs) {
                        var result1 = data1.d;
                        $('#' + '<%= lblTitle.ClientID %>').html(result1);

                        if (result1.toString().charAt(0) == "1") {
                            $('#' + '<%= JQDatePicker1.ClientID %>').addClass("datePicker9");


                        }
                        else {

                            $('#' + '<%= JQDatePicker1.ClientID %>').removeClass("datePicker9");


                        }
                        var res = result1.replace(result1.charAt(0), "");
                        $('#' + '<%= lblTitle.ClientID %>').html(res);
                        $('#' + '<%= hdn.ClientID %>').val(res);

                    }, true, "", function (data1, eventArgs) { alert('error') }
                );
    });


    function pageLoad(sender, args) {
        if (args.get_isPartialLoad()) {
            getTooltips();
        }
    }


}
</script>


<table dir="rtl">
    <tr>
        <td>


         <cc1:JQDatePicker ID="JQDatePicker1"    runat="server"
                IsRTL="True" DateFormat="YMD"   önchange="getTooltips();"
                Height="23px" AnimationType="Slide" IEDateFormat="YMD" Regional="fa"
                ChangeMonth="True" ChangeYear="True" Width="75px"></cc1:JQDatePicker>
     <asp:Label ID="lblTitle" runat="server" Font-Size="8pt"></asp:Label>
     <asp:HiddenField ID ="hdn" runat ="server" />
   <div id="divMyLoadingDiv2"  runat="server">

            </div>
        </td>
    </tr>
</table>