Maintain Panel Scroll Position On Postback in ASP.NET

Not find any solution till Now.
Hi Experts,
I am facing a problem.I have a asp.net page. I want to apply Maintain scroll position on this page. I have used

MaintainScrollPositionOnPostback="true" 

by all tree types (on cs,aspx and in web config) and many other Javascript functions (after googled).but no java script function works for me. If anyone have an Idea about how I Maintain my Scroll Position on my page .Please help Me. I googled a lots but not found any solution till now ..for example I used functions of java scripts like...

<form id="form1"  runat="server">
  <asp:ScriptManager ID="ScriptManager1" runat="server" ScriptMode="Release" />
   <script type="text/javascript">    
      var xPos, yPos;
      var prm = Sys.WebForms.PageRequestManager.getInstance();

      function BeginRequestHandler(sender, args) {
        if ($get('<%=Panel1.ClientID%>') != null) {         
          xPos = $get('<%=Panel1.ClientID%>').scrollLeft;
          yPos = $get('<%=Panel1.ClientID%>').scrollTop;
        }
     }

     function EndRequestHandler(sender, args) {
         if ($get('<%=Panel1.ClientID%>') != null) {       
           $get('<%=Panel1.ClientID%>').scrollLeft = xPos;
           $get('<%=Panel1.ClientID%>').scrollTop = yPos;
         }
     }
     prm.add_beginRequest(BeginRequestHandler);
     prm.add_endRequest(EndRequestHandler);
 </script>

 <asp:UpdatePanel ID="UpdatePanel1" runat="server">
   <ContentTemplate>
     <asp:Panel ID="Panel1" runat="server" Height="300">
        <----"my html table code here which have drop down,textbox,radiobutton,button etc controls"----->
     </asp:Panel>
   </ContentTemplate>
 </asp:UpdatePanel>
and many othes functions.

Thanks

</form>

Tags: Javascript, C# 3.5, ASP.NET