You are awesome! It works great. I actually decided to switch to NextGen Gallery from the built-in WordPress gallery. Your trick works there too. For others who may come across this, the correct value for NGG to put in the "Section(s)" field is "div.ngg-galleryoverview".
One other question. For those images that are not in a gallery (thus have no arrow overlay), I'd really like to have "click to close" active, meaning that the image closes if the user clicks anywhere on the image as well as anywhere outside the image. The reason is that I was watching the wife test my site (she works cheap!) and as she was going through and looking at various images (there are a lot), she was laboriously 'mouse-hunting' the "X" circle each time. Since my images are all different sizes and aspect ratios the "X" target is always in a different place.
It appears people don't always know or remember to try just clicking anywhere outside the box. Since I'm going to have a fair number of non-techie users this is an issue that would be cool to solve. Ideally, when "click to close" is active there would be an option to stop the "X" close circle appearing. In my experience, if a user has a popup image appear with no chrome, they will try just clicking on the image itself first.
I looked and found that Fancybox itself has an option to do this and I found where Easy Fancybox appears to set it to false and I tried to hack the code to turn it on but my PHP kung fu is weak and I failed. Is a click-to-close option something you might consider in a future rev of Easy Fancybox? I realize that it's probably not trivial to implement because it's conditional and only desired when the window content does not need interaction (iframe, video, gallery etc).
Either way, thanks for considering it and thanks especially for this great plugin.