Sys.WebForms.PageRequestManage...

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ASP.NET

hi..

am using button control for updating records to database. At this time i want that when user click on button to save entry to database its cursor changes into 'wait' cursor for that perticular time. i used following code but its giving error: Sys is undefind object.
what should i do??

<script language="javascript">
   var prm = Sys.WebForms.PageRequestManager.getInstance();
 
  prm.add_initializeRequest(InitializeRequest);
  prm.add_endRequest(EndRequest);
 
  function InitializeRequest(sender, args) 
  {
    $get('Container').style.cursor = 'wait'; 
 
    // Get a reference to the element that raised the postback,
    //   and disables it.
    $get(args._postBackElement.id).disabled = true;
  }
 
  function EndRequest(sender, args) 
  {
    $get('Container').style.cursor = 'auto';
 
    // Get a reference to the element that raised the postback
    //   which is completing, and enable it.
    $get(sender._postBackSettings.sourceElement.id).disabled = false;
  }
                </script>

any help would be highly appriciated..