top: (
                pos.top +                                                                // The absolute mouse position
                this.offset.relative.top * mod +                                        // Only for relative positioned nodes: Relative offset from element to offset parent
                this.offset.parent.top * mod -                                            // The offsetParent's offset without borders (offset + border)
                ( ( this.cssPosition === "fixed" ? -this.scrollParent.scrollTop() : ( scrollIsRootNode ? 0 : scroll.scrollTop() ) ) * mod)