It looks like the image stays under the entire TD or even the nested table. Can you add, say, a z-index of 1 to each of the images and a z-index of 99 to the image you're hovering over? I didn't see a :hover selector and didn't bother to read through the whole file…
You might have to set a position and a z-index for the tables as well.
I started from the outermost container and added a z-index to each containing block all the way to the image inside. I am assuming that the preview image (the one that appears on hover) should have the highest z-index, right?
Still having problems.
There is indeed a :hover selector. It's div.imgBox a.thumbViewer:hover .preview.
Maybe it's because I have a nested table that is repeated within each table cell and that's what messes up the z-index?
This thought gave me a clue so I tried it with only onc image and added borders to the tables so we can see if it hovers above or under and sure enough, it works fine http://dev.ccdmd.qc.ca/monde/hoverboxTest2.html.
So how can I achieve a whole row of images with this hover effect?
(If you're wondering why I nested tables, it had to do with problems with vertical-alignment. CSS alone is bit inconsistent as far that goes, as you may already know.)