Create Modal Popup in Ajax UpdateProgress

<asp:UpdateProgress ID="UpdateProgress1" runat="server"
        AssociatedUpdatePanelID="up_1" DisplayAfter="0">
    <ProgressTemplate>
        <div style="background-color: Gray; filter:alpha(opacity=60); opacity:0.60; width: 100%; top: 0px; left: 0px; position: fixed; height: 100%;">
        </div>
          <div style="margin:auto;
              font-family:Trebuchet MS;
              filter: alpha(opacity=100);
              opacity: 1;
              font-size:small;
              vertical-align: middle;
              top: 45%;
              position: fixed;
              right: 45%;
              color: #275721;
              text-align: center;
              background-color: White;
              height: 100px;
              ">
                <table style=" background-color: White; font-family: Sans-Serif; text-align: center; border: solid 1px #275721; color: #275721; width: inherit; height: inherit; padding: 15px;">
                <tr>
                <td style=" text-align: inherit;"><img src="images/loading_48x48px.gif" alt="Loading"  /></td>
                <td style=" text-align: inherit;"><span style="font-family: Sans-Serif; font-size: medium; font-weight: bold; font">Loading...</span></td>
                </tr>
                </table>
        </div>
    </ProgressTemplate>
</asp:UpdateProgress>