Placing this script on the page will wait {delay_seconds} after the page is loaded and then will redirect to {redirect_url} ...

js_redirect.html

<script type="text/javascript">
  $(document).ready(function() {
    var redirect_url = 'http://example.com/cool';
    var delay_seconds = 3;

    setTimeout( function() {
                  window.location=redirect_url;
                }, (delay_seconds * 1000) );
  });
</script>