modals on jQuery

var _document = $(document),
    _window = $(window),
    body = $("body");

var modals = function () {
  var overlay = $(".overlay"),
      modalsWrapper = $(".modals-wrapper"),
      modal = $(".modal"),
      setTimeout;

  function compareHeight() {
    var visibleModal = $(".modal_visible"),
        visibleModalHeight = visibleModal.innerHeight(),
        windowHeight = _window.innerHeight();

    if (visibleModalHeight > windowHeight) {
      visibleModal.addClass("modal_relative");
    } else if (visibleModalHeight < windowHeight) {
      visibleModal.removeClass("modal_relative");
    }
  }

  _window.on("resize", function () {
    if (modal.hasClass("modal_visible")) {
      clearTimeout(setTimeout);
      setTimeout = setTimeout(compareHeight, 100);
    }
  });

  return {
    open: function (elem) {
      var thisModal = $(".modal_" + $(elem).data("modal"));
      
      modalsWrapper.addClass("modals-wrapper_visible");
      thisModal.addClass("modal_visible");
      overlay.addClass("overlay_visible");
      body.addClass("body_overflow_hidden");

      if (thisModal.innerHeight() > _window.innerHeight()) {
        thisModal.addClass("modal_relative");
      }
    },

    close: function () {
      modalsWrapper.removeClass("modals-wrapper_visible");
      setTimeout(function () {
        modal.removeClass("modal_visible modal_relative");
        overlay.removeClass("overlay_visible");
      }, 500);
      body.removeClass("body_overflow_hidden");
    }
  }
}();

_document.on('click', '.open-modal', function (e) {
  e.preventDefault();
  modals.open(this);
  return false;
});

_document.on('click', '.close-modal', function (e) {
  e.preventDefault();
  modals.close();
  return false;
});