code: function() {
      if (!$.browser.msie || ($.browser.msie && parseInt($.browser.version) > 8 )) {
        var self = this;
        this.$el.animate({
          marginBottom: "-10px",
          opacity:      "0",
          display:      "block"
        }, 180, function() {
          self.$el.css({visibility: "hidden"});
        });
      } else {
        this.$el.hide();
      }
    }
docs: Animate infowindow to disappear