J Query Pop up window does can't hold server Control like Asp.net control

See more:

C#

ASP.NET

Javascript

C#4.0

Hello Guy's ,
This is my first question on code project website but access I think last two year's.coming to Question, My question is I have one Pop up window this window make in J-Query. This window hold Two Text Box's and Two Buttons. Text Box are Email id and another is Password and button is Login and Cancel. my Problem is When I Press the Login Button can't fire Clicking event. I have try every type of working but can't success. snippet code is here

<div  id="basic-modal-content">
           <h3><strong>Snindiasoftware Sign in</strong><hr />
               <h3>
               </h3>
               <p style="color:#FFF;">
                   <strong>All fields are required.</strong></p>
               <div class="light_box">
                   <div class="light_boxleft">
                       <a href="Forgot-Password.aspx">Passowrd?/</a><br />
                       <div class="light_boxright">
                           <asp:TextBox ID="Txt_EmailID" runat="server" class="nameInput"></asp:TextBox>
                           <br />
                           <a href="Create-User.aspx">Register</a></div>
                   </div>
                   <div class="light_box_2">
                       <script language="javascript" type="text/javascript">

                           function myclear() {

                               window.print();
                   alert("hadfs");
               }

           </script>
                       <asp:Button ID="Btn_Login" runat="server" class="buttonPro"
                           onclick="Btn_Login_Click" OnClientClick="myclear()" Text="LogIn" />
                       <asp:Button ID="Btn_Cancel" runat="server" class="buttonPro"
                           OnClientClick="clear()" Text="Cancel" />
                   </div>
               </div>
           </h3>
    </div>

But java script is call, I can't understanding why can't the fire Button click.
Thanks for Advance. I waiting your Answer.