overall issue with AsyncPostBack updated panel javascript

  <asp:UpdatePanel ID="UpdatePanel2" runat="server">                 <ContentTemplate>                    GRID-------------                                            <asp:TextBox ID="txtname" runat="server" Width="181px" AutoPostBack="True"                             Height="15px"></asp:TextBox>                     <asp:Button runat="server" ID="btn_getname" OnClick="btn_getname_Click" Text="" />                                            <asp:ListBox ID="listbox1" runat="server" Height="252px" SelectionMode="Multiple"                             Width="141px"></asp:ListBox>                     </div>                 </ContentTemplate>                 <Triggers>                     <asp:AsyncPostBackTrigger ControlID="btn_getname" />                 </Triggers>             </asp:UpdatePanel> issue 1 ------------ on grid header click a javasscript function getdetails() is executed  which has  document.getElementById('<%=btn_getname.ClientID %>').click(); in server side code of btn_getname event i have code for making either txtname or listbox1 visible true depending on some condition but with below  <Triggers>                     <asp:AsyncPostBackTrigger ControlID="btn_getname" />                 </Triggers> 1) i need to write alert in javascript function getdetails()  to hit the  btn_getname event without it  in IE it doesnot work 2) the user after clicking one grid header cell , if clicked another header cell than   function getdetails()  doesnot get initated but if i remove <Triggers>                     <asp:AsyncPostBackTrigger ControlID="btn_getname" />                 </Triggers> and place   <asp:Button runat="server" ID="btn_getname" OnClick="btn_getname_Click" Text="" /> outside the update panel  the above 2 points 1) & 2)  does work properly even without alert the btn_getname event gets executed in IE issue2 ----------- on grid header click a javasscript function getdetails() is executed  and a control is made visible i have a javascript function ESCpress which  has  document.getElementById('<%=btnclear.ClientID %>').click(); in its server side i have code for making the controls visibe false and its works propely but postback happens if i do the same in cleint side (without postback ) ie writing the script in  javascript function ESCpress() instead of  document.getElementById('<%=btnclear.ClientID %>').click(); it does server the puropse but on every postback of the page the controls becomes visible true which i dont want i need the controls to be visible only when the grid header cell is clicked  i checked with function getdetails()  but without header cell clik function getdetails() does not get initated i hope i am clear with full process