popup

default.aspx
html code:
 <form id="form1" runat="server">
    <div>
     Focus to open a popup :
        <asp:TextBox ID="txtOpenPopup" runat="server" onkeydown="OpenPopup()" onmousedown="OpenPopup()" />
        <br />
        <br />
        <asp:FileUpload ID="FileUpload1" runat="server" />
        <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="pREVIEW" />
        <br />
        <br />
        <br />
        <asp:ImageButton ID="ImageButton1" runat="server"  onkeydown="OpenPopup()" onmousedown="OpenPopup()" Height="70px" ImageUrl="~/images/beauty (9).jpg" />
        <br />
        <script language="javascript">

            function OpenPopup() {

                popup("PopupPage.aspx");

            }
          
           
</script>
        <script>
    function popup(url) {

    var width = 600;

    var height = 400;

    var left = (screen.width - width) / 2;

    var top = (screen.height - height) / 2;

    var params = 'width=' + width + ', height=' + height;

    params += ', top=' + top + ', left=' + left;

    params += ', directories=no';

    params += ', location=no';

    params += ', menubar=no';

    params += ', resizable=no';

    params += ', scrollbars=no';

    params += ', status=no';

    params += ', toolbar=no';

    newwin = window.open(url, 'windowname5', params);

    if (window.focus) { newwin.focus() }

    return false;

}

</script>

    </div>
    </form>


button:

        FileUpload1.SaveAs(Server.MapPath("images/")+FileUpload1.FileName);
        string s = "images/" + FileUpload1.FileName;
        ImageButton1.ImageUrl=s;
        Session["a"] = s;

popup.aspx:
form load:
Image1.ImageUrl = Session["a"].ToString();