Install image viewer on Website

I have a large number of .jpg thumbnails stored in a complex directory hierarchy on a Website. I need a Web page that allows a user to navigate up and down the directory hierarchy, which would be on the left, and SEE these associated thumbnails on the right. No other features are needed or allowed. Site is hosted at: [login to view URL] (to see hosting capabilities). With the right (open source) software, this is a trivial job, otherwise it is not feasible. Be certain that you have read the above carefully and fully understand the requirement. My experience has been that most developers respond without doing this, and it is ALWAYS obvious. FYI, I have designs for Websites in several industries that are more advanced than anything that currently exists and I will be looking for serious developers who are interested in equity participation for multi-million $ sites.