$(function () {
  var $window = $(window)
    , $top_link = $('#toplink')
    , $body = $('body, html')
    , offset = $('#code').offset().top;

  $top_link.hide().click(function (event) {
    event.preventDefault();
    $body.animate({scrollTop: 0}, 800);
  });

  $window.scroll(function () {
    if ($window.scrollTop() > offset) {
      $top_link.fadeIn();
    } else {
      $top_link.fadeOut();
    }
  });

  var $popovers = $('.popin > :first-child');
  $('.popin').on({
    'click.popover': function (event) {
      event.stopPropagation();

      var $container = $(this).children().first();

      //Close all other popovers:
      $popovers.each(function () {
        var $current = $(this);
        if (!$current.is($container)) {
          $current.popover('hide');
        }
      });

      // Toggle this popover:
      $container.popover('toggle');
    },
  });

  //Hide all popovers on outside click:
  $(document).click(function (event) {
    if ($(event.target).closest($('.popover')).length === 0) {
      $popovers.popover('hide');
    }
  });

  //Hide all popovers on escape:
  $(document).keyup(function (event) {
    if (event.key === 'Escape') {
      $popovers.popover('hide');
    }
  });
});