JS popup / thank you message show for 3s

//Thank you message show for 3 seconds
//HTML
<button id="submit-reg-form" class="ic-btn" data-toggle="modal" data-target="#thankyou">Registration now</button>
<div class="modal fade" id="thankyou" tabindex="-1" role="dialog" aria-labelledby="thankyouLabel" aria-hidden="true">
  <div class="modal-dialog" role="document">
    <div class="modal-content">
      <div class="modal-body">
        <h3>Thank you</h3>
        <span class="ic-check"><i class="icofont icofont-check-circled"></i></span>
        <span>Registration Successful</span>
        <span>You get a successful mail in your eamil  </span>
      </div>
    </div>
  </div>
</div>
//JS
$('#submit-reg-form').click(function(){
    setTimeout("$('#thankyou').modal('hide');",3000);
});