ajax modal popup extender not working in chrome and mozilla while hosted in server but it works in ie

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ASP.NET

Javascript

jQuery

C#3.5

, +

Hi to all,
Here i done ajaxtoolkit:modalpopupexternder while if i run in local machine popup will show when i host in webguru servre popup will do show its just refresh.what is the problem can anybody suggest

Design:

<asp:LinkButton Text="" ID="btntarget" runat="server">
  <ajaxToolkit:ModalPopupExtender ID="newmodal"  runat="server" PopupControlID="newpopup" TargetControlID="btntarget"
CancelControlID="exitt" BackgroundCssClass="modalBackground" >

<asp:Panel ID="newpopup" runat="server" ScrollBars="Auto" Height="600px" Width="900px"   CssClass="modalPopup" Style="display: none">
    <div class="header">

Overview Details

</div>
  <div class="body">
      <table border="0" cellpadding="0" cellspacing="0">
          <tr>
             <td>
              <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" EmptyDataText="No Updates Avaliable For this Task"
                    AllowPaging="True" PageSize="50000"
                    CssClass="myGridStyle"

          onpageindexchanging="gridtask_PageIndexChanging"  OnRowDataBound="gridtask_rowdatabound"  >
       <columns>
       </columns>
             </td>
          </tr>
      </table></div>