JAVASCRIPT TO refresh the Usercontrol or Update Panel or Div

Hi

Any one please help.

How to refresh the Usercontrol or Update Panel or Div on the javascript events

This code I want to do refresh:
        <div id="updateusercontrol" style="width: 1003px; margin: 0 auto;background-color:#fff;">
           <ajax:UpdatePanel ID="UpdatePanelLoginUserProfile1" runat="server" UpdateMode="Conditional">
                       <ContentTemplate>
                              <usr:LoginPanel ID="lgnBottonPanel" runat="server" Visible="false"></usr:LoginPanel>
                        </ContentTemplate>
                 </ajax:UpdatePanel>
             
        </div>
    </div>

I need to refresh the contril ID="lgnBottonPanel" inside the update panel on the button click from the pop up using javascript

Best regards,

Renuka.V