javascript - Error in UpdateProgress -

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i using updateprogress show progress during postback, getting run time error "microsoft jscript runtime error: 'this.get_element().style' null or not object"

this script:

var prm = sys.webforms.pagerequestmanager.getinstance(); prm.add_beginrequest(beginrequesthandler); prm.add_endrequest(endrequesthandler); function beginrequesthandler(sender, args) {     //shows modal popup - update progress     var popup = $find('<%= mdlprogress.clientid %>');     if (popup != null) {         popup.show();     } } function endrequesthandler(sender, args) {     //hide modal popup - update progress     var popup = $find('<%= mdlprogress.clientid %>');     if (popup != null) {         popup.hide();     } }

design code:

<table>    <tr>       <td>          <ajaxtoolkit:modalpopupextender id="mdlprogress" runat="server" targetcontrolid="updateprogress"                             popupcontrolid="updateprogress" backgroundcssclass="modalbackground" />          <asp:updateprogress id="updateprogress" runat="server">               <progresstemplate>             <asp:image id="image1" imageurl="~/app_themes/ribo/images/processing.gif"    alternatetext="processing"  runat="server" />                 </progresstemplate>           </asp:updateprogress>            </td>          </tr>  </table>

this.get_element returning null. can check alert()ing result of $find method.

have considered using jquery? it's perfect kind of thing.


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