picking files (server side) - need help please

Hi NG. I was wondering how I can make it possible to pick certain files on the server. EXAMPLE: When inserting pictures by selecting them through <form bla bla> <input type=file> </form> I browse my own PC for files. The site I'm currently working on needs to make it possible for the users (through an admin module) to select certain pictures that they want to be displayed on the site. Assuming that those pictures have already been uploaded to a certain dir on the web server, can this be done and if so how would one do this? regards ~ Sviss