case 'auto':
                containerTop = this.element.offset().top + this.element.outerHeight() - parentOffset.top;
                if (containerTop + this.container.outerHeight() >= this.parentEl[0].scrollHeight) {
                    containerTop = this.element.offset().top - this.container.outerHeight() - parentOffset.top;
                    drops = 'up';
                }
                break;