I was not happy with the zoom scripts that I found on the net, so I wrote one myself, or one that simulates it. It has become an extremely simple one, and can be seen in action here (function toggleZoom). Click the images to zoom in and click to zoom out again.

However, only the images with an initial width of >= 100 pixels will zoom out again. The ones width an initial width of < 100 (nrs. 4, 5 and 7) won't. Why is that, and how do I solve it?