I have a number of photo galleries on my site and use popups to allow users to see larger versions of the images.

Here is an example:
http://www.salksound.com/songtower%20images.htm

For some reason, photos on the page linked below are loading on their own pages rather than as pop-ups. I have reviewed the settings and they all appear to be the same. Any ideas why the images on the following page won't load as popups? (Open link in: is set to "Not Specified" in all of these).

http://www.salksound.com/ht2-TL%20-%20images.htm

Thanks for any help you might be able to offer.

- Jim