js modal dialog: send mail, countdown and redirect

gistfile1.js

  /*
   * form mail + модальное окно при сабмите
   */
  $.fn.extend({
    diplomMailForm: function(data) {
        countdown = function (element, seconds, minutes) {
            var interval;
            minutes = minutes || 0;
            seconds = seconds || 5;
            return interval = setInterval(function () {
                var el;
                el = document.getElementById(element);
                if (seconds === 0) {
                    if (minutes === 0) {
                        clearInterval(interval);
                        window.location.href = "/";
                        return;
                    } else {
                        minutes--;
                        seconds = 60;
                    }
                }
                el.innerHTML = seconds;
                seconds--;
            }, 1000);
        };
      return this.each(function() {
        var self, typeIsArray;
        self = this;
        typeIsArray = Array.isArray || function(value) {
          return {}.toString.call(value) === '[object Array]';
        };
        return $(this).on('submit', function() {
          var labels, lbl, txt, _i, _len, _ref;
          labels = {};
          _ref = $(this).find('input, select, textarea');
          for (_i = 0, _len = _ref.length; _i < _len; _i++) {
            lbl = _ref[_i];
            txt = $(lbl).attr('name');
            if (txt) {
              txt = txt.replace(/^form\[/g, "");
              labels[txt] = $(lbl).siblings('label').html() || $(lbl).parent().siblings('label').html() || $(lbl).attr("placeholder");
            }
          }
          $.post('/send.php', {
            data: $(this).serialize(),
            labels: labels
          }, function(r) {
            if (r.status && r.status === 'success') {
              $('#modalDlg').show();
              return countdown('countdown', 4);
            }
          });
          return false;
        });
      });
    }
  });