Hi,

To get reference to AJAX javascript object you may use public method $find(id). Below is an example.

<ig:WebResizingExtender ID="WebResizingExtender1" runat="server" TargetControlID="Panel1" />
<asp:Panel ID="Panel1" runat="server" BackColor="#FF9933" Height="69px" Width="328px"> </asp:Panel>
  <script type="text/javascript">
  function checkResizer()
  {
  var resizer = $find('<%=WebResizingExtender1.ClientID%>');
  alert('resizer id:' + resizer.get_id() + ', maxWidth:' + resizer.get_maximumWidth());
  var target = resizer.getTargetElement();
  target.style.border = '1px solid red';
  }
  </script>
  <input type="button" value="check resizer" onclick="checkResizer()" />

Instead of alert you may put debugger; and check all available public methods of resizer object.