pop up box confirm overlay

 <div class="box">
<a class="button" href="#popup1">Let me Pop up</a>
</div>

<div id="popup1" class="overlay">
<div class="popup">
    <h2>Here i am</h2>
    <a class="close" href="#">×</a>
    <div class="content">
        Thanks for pop me out of that button, but now i'm done so you can close this window.
    </div>
<asp:Button ID="btnOk" runat="server" Text="OK" />

        <asp:Button ID="btnCancel" runat="server" Text="Cancel" />
</div>