Automatically Jquery close alert /dialog box

Automatically Jquery close alert /dialog box 

//Add below html code into body

<div id="dialog1" title="Alert Message" style="display:none">

    <asp:Label ID="lblMessage" runat="server" Text="Record Inserted Successfully"></asp:Label>

</div>

//add below code into head

<script type="text/javascript">

        function DisplayPOP() {

            var mydiv = $('#dialog1');

            mydiv.css('display', 'block');

            mydiv.dialog({ autoOpen: false, height: 20, width: 300 });

            mydiv.dialog('open');

            //send the time

            AutoCloseDialogBox(3000);

            return false;

        }

        function AutoCloseDialogBox(WaitSeconds) {

            setTimeout(function () { $("#dialog1").dialog("close"); }, WaitSeconds);

        }

 </script>