I'm working on a web application project (or a colleague is, actually) that needs an interface for adding images/organising an image bank. The interface would look much like the folder view in Windows environment, with preview pictures of the folders and a breadcrumb navigation to see where you're at (the way it's in Vista, at least). For this project it cannot be the regular navigation tree structure, all that's needed are the folders and a possibility to move in and out of them. Also, it cannot just be an "upload a file from your computer" option, either.
How could this be achieved? With PHP, jQuery or other JavaScript, plain HTML/CSS... ? So far all searches have turned out fruitless.
P.S. Sorry about the possible wrong forum, but I didn't think this was really a HTML/CSS or PHP/MySQL question...