高分：在ASPX页面里已经放置了SCRIPT MANAGER、UpdatePanel 和UpdateProcess 如何在页面载入时显示一下 高分求助!!!!!

如题：
一个asp页面上已经放置了相关的ajax控件，但是如何在页面载入（要求page_load)时 显示一下 Updateprogress模块的内容，载入完毕取消显示
同时 不能用 Response.Write会破坏原有架构
代码如下：<html>
<head runat="server">
    <title>信息查询展示区</title>
    
    <link href="../BaseCSS.css" rel="stylesheet" type="text/css" />
    <script language="JavaScript" type ="text/javascript">
    <!--
    Image01= new Image(100,50) ;
    Image01.src = "../Picture/gohome.jpg" ;
    
   -->
    </script>
</head><body topmargin=0 leftmargin =0 >
  <form runat=server>    <div runat="server">
        <table style="width: 99.5%;" align="center" >
            <tr class="FontBase">
                <td>
                    <asp:Button ID="ButtonSearch" runat="server" Text="查询"  Font-Size="12px"
                        onclick="ButtonSearch_Click" />
                    
                </td>
            </tr>
         </table>
 <asp:ScriptManager ID="ScriptManager1" runat="server">
 </asp:ScriptManager>
 
 <asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
 <ContentTemplate>
    <table style="width: 99.5%;" align="center" >                        <tr>
                <td align=center>                    
                    <asp:Panel ID="Panel1" runat="server" ScrollBars="Auto" Width="100%">               
                        <asp:GridView ID="GridView1" runat="server" Width="100%"
                            BorderColor="#4AADCD" BorderStyle="NotSet" BorderWidth="1px" CellPadding="2"
                            AllowPaging="True" PageSize="15" Font-Size="12px" 
                            onpageindexchanging="GridView1_PageIndexChanging" AllowSorting="True" 
                            onsorting="GridView1_Sorting" onrowdatabound="GridView1_RowDataBound" EmptyDataText="查无信息."
                            OnRowCreated="GridView1_RowCreated"
                            >
                            
                            <FooterStyle BackColor="#99CCCC" ForeColor="#003399" />
                            <RowStyle BackColor="White" ForeColor="#003399" Wrap="false" />
                            <PagerSettings Visible = "true" />
                            <SelectedRowStyle BackColor="#009999" Font-Bold="True" ForeColor="#CCFF99" />
                            <HeaderStyle BackColor="#F8EDB6" Font-Bold="True" ForeColor="#003399" />
                            <pagertemplate>
                                <table width="100%" bgcolor="#CCCCFF" cellspacing="0" border="0">
                                <tr>
                                    <td style="text-align:left">
                                        <asp:Label id="lblCount" runat="server"></asp:Label>
                                        
                                        第<asp:Label id="Label1" runat="server" text='<%# ((GridView)Container.Parent.Parent).PageIndex+1  %>' />页 
                                        共<asp:Label id="lblPageCount" runat="server" text='<%# ((GridView)Container.Parent.Parent).PageCount  %>' />页 
                                        <asp:linkbutton id="btnFirst" runat="server" causesvalidation="False" commandargument="First" commandname="Page" text="首页" />
                                        <asp:linkbutton id="btnPrev" runat="server" causesvalidation="False" commandargument="Prev" commandname="Page" text="上一页" />
                                        <asp:linkbutton id="btnNext" runat="server" causesvalidation="False" commandargument="Next" commandname="Page" text="下一页" />                          
                                        <asp:linkbutton id="btnLast" runat="server" causesvalidation="False" commandargument="Last" commandname="Page" text="尾页" />                                            
                                        <asp:textbox id="txtNewPageIndex" CssClass="FontBase"  runat="server" width="30px" text='<%# ((GridView)Container.Parent.Parent).PageIndex + 1  %>' />
                                        <asp:linkbutton id="btnGo" runat="server" causesvalidation="False" commandargument="-1" commandname="Page" text="跳转" /><!-- here set the CommandArgument of the Go Button to '-1' as the flag -->
                                     </td>
                                </tr>
                                </table>
                            </pagertemplate>                       
                        </asp:GridView>
                    </asp:Panel>
                </td>            </tr>
            <tr>
            <td align="left">
                <asp:Label ID="LabelRes" runat="server" Text="Label" Font-Size="12px" 
                    BorderStyle="None" style="text-align: left"></asp:Label>
                    
                <asp:Label ID="LabelFirstShow" runat="server" Text="Label" Font-Size="20px"  ForeColor="BlueViolet"
                    BorderStyle="None" style="text-align: left"></asp:Label>
                <asp:Label ID="LabelSearchFilter" runat="server" Font-Size="11px" 
                    ForeColor="#0066FF" Text=""></asp:Label>                <Br>
                <asp:HyperLink ID="HyperLink1" runat="server" ImageUrl="../Picture/gohome.jpg" NavigateUrl="../Default.aspx" Target="_top"></asp:HyperLink> 
                </td>
            </tr>
        </table>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="ButtonSearch" EventName="Click" />
</Triggers>
 </asp:UpdatePanel>
     <asp:UpdateProgress ID="UpdateProgressWait" runat="server">
        <ProgressTemplate>
            <div style="position:absolute;left:48%;top:20%;height:17px;width:80px; text-align:center;
                background-color:#F8EDB6;filter:alpha(opacity=100); ">
                    <a style="font-size:13px; color:Blue;">请您稍等...</a>        
                    <img alt="" id="picA" src="../Picture/ajax-loader.gif" />
            </div>
            </ProgressTemplate>
     </asp:UpdateProgress>
    </div>
    </form>
</body>
</html>