button onclient clicked javascripts is not working on tab container

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ASP.NET

Hello


my JavaScript function:

<script language="javascript" type="text/javascript">
<pre lang="cs">function ShowHideAttachmentControls(btnId) {
           var ButtonID = btnId.id;
           var ButtonName = ButtonID.split(&#39;_&#39;);
           var TrNumber = parseInt(ButtonName[1]) + 1;
           var TrId = document.getElementById(&#39;trAttachment_&#39; + TrNumber);
           TrId.style.display = DisplayProperty;
           btnId.style.display = &#39;none&#39;;
       }
   &lt;/script&gt;</pre>

my code:

<ajax:TabContainer ID="tabcontainer" runat="server" Font-Size="Medium" Width="100%"
        ActiveTabIndex="2" AutoPostBack="true">

<ajax:TabPanel runat="server" HeaderText="Email other Details" ID="TabPanel2" >
<contenttemplate>

<%-- --%>
<tr id="trAttachment_3" runat="server" style="display: none;">

<%----%>
<tr id="trAttachment_4" runat="server" style="display: none;">

<%----%>
<tr id="trAttachment_5" runat="server" style="display: none;">

<%-- --%>

<%----%> <tr id="trAttachment_2" runat="server" style="display: none;">   Attachment 1 <asp:Label Id="lblAttachemnt1" runat="server"><asp:FileUpload ID="flupEmailAttachment" runat="server" /> <input type="button" title="+" runat="server" id="btnAddMoreAttachment_1" value="+" /> No of Estimates <asp:TextBox runat="server" ID="txtNoEstimates">  <asp:RegularExpressionValidator ID="revNoEstimates" ControlToValidate="txtNoEstimates" ValidationExpression="\d+" Display="Static" EnableClientScript="true" ErrorMessage="Please enter numeric value" runat="server" />   Attachment 2 <asp:Label Id="lblAttachemnt2" runat="server"><asp:FileUpload ID="flupEmailAttachment2" runat="server"/>  <input type="button" title="+" runat="server" id="btnAddMoreAttachment_2" value="+" />
Attachment 3	<asp:Label Id="lblAttachemnt3" runat="server"> <asp:FileUpload ID="flupEmailAttachment3" runat="server"/>  <input type="button" title="+" runat="server" id="btnAddMoreAttachment_3" value="+" />
Attachment 4	<asp:Label Id="lblAttachemnt4" runat="server"> <asp:FileUpload ID="flupEmailAttachment4" runat="server" />  <input type="button" title="+" runat="server" id="btnAddMoreAttachment_4" value="+" />
Attachment 5	<asp:Label Id="lblAttachemnt5" runat="server"><asp:FileUpload ID="flupEmailAttachment5" runat="server" />
Comments	<asp:TextBox runat="server" ID="txtEmailComments" Width="500px">
Note	<telerik:RadEditor ID="RadEditor2" Height="340px" Enabled="true" TableLayoutCssFile="~/Editor/css/TableLayoutCssFile.css" Width="700" runat="server"> <ImageManager ViewPaths="~/imagesRadEditor/" UploadPaths="~/imagesRadEditor/" DeletePaths="~/imagesRadEditor/" /> <mediamanager viewpaths="~/imagesRadEditor/" uploadpaths="~/imagesRadEditor/" deletepaths="~/imagesRadEditor/"> <flashmanager viewpaths="~/imagesRadEditor/" uploadpaths="~/imagesRadEditor/" deletepaths="~/imagesRadEditor/"> <documentmanager viewpaths="~/imagesRadEditor/" uploadpaths="~/imagesRadEditor/" deletepaths="~/imagesRadEditor/"> <fontnames> <telerik:editorfont value="Arial" xmlns:telerik="#unknown"> <telerik:editorfont value="Arial Narrow" xmlns:telerik="#unknown"> <telerik:editorfont value="Arial Black" xmlns:telerik="#unknown"> <telerik:editorfont value="Vardana" xmlns:telerik="#unknown"> <telerik:editorfont value="Tahoma" xmlns:telerik="#unknown"> <telerik:editorfont value="Century" xmlns:telerik="#unknown"> <content>
<asp:Button ID="btnSendEmail" runat="server" Text="Send Email" Width="150px" OnClick="btnSendEmail_Click" />

so when i clicked

onclick="ShowHideAttachmentControls(this);"

this function is not fired on click.

without tab container is working but with tab container is not working

i set autopost tabcontainer = true but is not working

how to do?