update panel problem

[Miss Maheshwari]

i have used an update panel on login page...its working fine on local but when i upload my page on net...its not working fine....the page is refreshed on every click of button....the code is..

<form id="f1" runat="server">
<atlas:ScriptManager ID="scriptmanager1" OnAsyncPostBackError="ScriptManager1_AsyncPostBackError" runat="server" ScriptPath="./Script" EnablePartialRendering="true">
</atlas:ScriptManager>

				  <div style="padding-right:30px;">

				  <atlas:UpdatePanel ID="upd1" UpdateMode="Conditional" RenderMode="Inline" runat="server">
				  
				  <ContentTemplate>
				    <table width="50%" border="0" align="center" cellpadding="5" cellspacing="0" class="table">
                            <tr>
                                <td class="td" colspan="3" style="color: red">
                                    <asp:Literal ID="ltrmsg" runat="server"></asp:Literal>
                                    <asp:Label ID="lblmsg" runat="server"></asp:Label></td>
                            </tr>
                          <tr>
                            <td class="td"><strong>User ID </strong></td>
                            <td width="39%" class="td"><input name="user\_id" type="text" class="form" runat="server" id="user\_id" maxlength="20" /></td>
                            <td width="15%" rowspan="2" class="td"><input type="image" src="login.jpg" runat="server" name="Submit" value="Submit" id="Image1" onclick="return validForm();" onserverclick="Image1\_ServerClick" tabindex="2" />
                            </td>
                          </tr>
                          <tr>
                            <td class="td"><strong>&nbsp;Password</strong></td>
                            <td class="td"><input name="pass" type="password" runat="server" class="form" id="pass" maxlength="20" tabindex="1"></td>
                          </tr>
                        </table>
                        </ContentTemplate>
				  </atlas:UpdatePanel>
                      </div>
                  </form>

but when user enter wrong user-id or password its not showing the msg in literal ...and the page is refreshed on every click pleas