How do I call JAvascript function inside AJAX Update progress

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Hi Dear All

Could anyone please tell me how to call and run a javascript/jquery function inside an asp updateprogress control in aspx page.

I have an asp Label with text "Updating with Your Credentials!" on the aspx page and an UpdateProgress with message "Please Wait...".
When ever the update progress is enabled on the aspx page I have to clear the text on the label.
kindly help me if anyone has idea about this.

Added Code:

<asp:ScriptManager ID="ScriptManager1" runat="server">
<asp:UpdatePanel ID="UpdatePanel1" runat="server">

<div class="labl_centls"><br />
<asp:Label ID="lblResult" runat="server" Text="Updating with Your Credentials!" >
</div>
<asp:UpdateProgress ID="UpdateProgress1" runat="server">
<ProgressTemplate>
<img src="Images/ajax-loaderr.gif" alt="uploading..." /> <br/>
Please Wait...
</ProgressTemplate>

<div style="width: 100%; height: 400px; overflow:scroll;">
<asp:GridView ID="gvSearchData" runat="server" HeaderStyle-CssClass="top_rd_hd" CellPadding="0" CellSpacing="0"
AutoGenerateColumns="false" onrowcancelingedit="gvSearchData_RowCancelingEdit"
onrowdeleting="gvSearchData_RowDeleting" onrowediting="gvSearchData_RowEditing"
onrowupdating="gvSearchData_RowUpdating" >

<asp:TemplateField HeaderText="S.No.">
<%#Container.DataItemIndex+1 %>

<asp:TemplateField ItemStyle-Width="0.1%" >

<asp:Label ID="lblId" runat="server" Text='<%#Eval("id")%>' Visible="false">


<asp:TemplateField HeaderText="COLUMN1">

<asp:Label ID="lblCol1" runat="server" Text='<%#Eval("column1")%>'>


<asp:TemplateField HeaderText="COLUMN2">

<asp:Label ID="lblCol2" runat="server" Text='<%#Eval("column2")%>'>


<asp:TemplateField HeaderText="EXISTANCE">

<asp:Label ID="lblExistnc" runat="server" Text='<%#Eval("existance")%>' >


<asp:TemplateField HeaderText="MODIFIER">

<asp:TextBox ID="txtModifier" runat="server" Text='<%#Eval("modifier")%>'>


<asp:Label ID="lblModifier" runat="server" Text='<%#Eval("modifier")%>'>


<asp:TemplateField HeaderText="EFFECTIVE DATE">

<asp:Label ID="lblEfDate" runat="server" Text='<%#Eval("effectivedate")%>' >


<asp:CommandField ShowEditButton ="true" HeaderText="EDIT"/>
<asp:CommandField ShowDeleteButton="true" HeaderText="DELETE"/>
</div>

Sir My Requirement is When ever the update progress shows "Please Wait..." then the text on the asp Label lblResult should be cleared.
Kindly give me a solution if you have idea about this.