When I downloaded zView in 2009 I was hoping to have a look at addingIf you are brave enough, I recommend you to start at http://sourceforge.net/projects/z-tools/ -- there are all shared headers, some instructions etc... But beware, building zView is a little bit tricky, it's not just one make and done. But it's more or less well documented.
the ability to open an image and then step to the next in the same folder.
I will continue looking into it to see what I can learn.