Feature request: changeImageonHover should allow selection of an image, or said another way, linkURL is not useful when changeImageonHover is enabled because you cannot stop on an image and click it.
It would seem that the changeImageonHover option has no use or value if you are unable to select an image and act on it when the option is enabled. I think this can be easily corrected with a couple of lines of actionscript in the thumbnail button that senses rollover and switches the image unless a thumbnail has been clicked:
changeImageonHover = false;
and a new 'perimeter' button surrounding the thumbnail array to sense mouse movement outside the thumbnails and turn changeImageonHover back on if necessary:
changeImageonHover = true;
Now you can rollover the thumbnails until you see the image you want, click on the thumbnail to select it, and then move to the image to click it and link to your linkURL.