* If you click and DRAG UPWARDS your mouse, the zoom ratio increases,
* if you click and DRAG DOWNWARDS your mouse, the zoom ratio decreases,
* NEW! if you click and DRAG TO THE RIGHT your mouse, the zoom window increases,
* NEW! and if you click and DRAG TO THE LEFT your mouse, the zoom window decreases.
Making use of the overflow and scrollLeft DOM property to scroll elements is a much more effective use of the CPU, over animating using CSS top/left. So this episode of J4D demonstrates the same effect used in two completely different ways.