We do a variety of sites that involve listings of some kind, where you search by town or type or soemthing and then get a list of cars, companies etc. The latest one which is a training & meeting venue directory site has the usual lists that eventually end up with a full page ad for a certain venue.
From here there is a link to the individual rooms at that venue. We wanted to include a photo of the rooms along with it´s description, costs, etc. Only problem was that including a decent sized photo takes up two much room. There was always the option of using hidden DIVS and toggling whether the display with a simple link, but this time I decided to give OverLib a try.
I´ve used this before for displaying simple text on our appointment reminder system´s calendar page to display the appointments for a certain date, but after a bit of digging and messing around I managed to get it to display the pictures in the popup as well. You just have to be careful about putting " or ´ in the image path as it can screw up the entire page.
Have a look, you can get the code off the site and it might come in useful.