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>