271604 Online Client File Management

I need a Script written in php 5 that will allow my clients to upload and download large files (200mb) onto/from my site. The site is on a shared hosting account. I would like the script to have ftp functionality. It must be secure. Needs: Client side: - password and username login - file uploads to an upload directory - file downloads of Admin selected files Admin: - password login - file upload and download - set access to client downloads - create/edit users - change admin password - The site needs to be easily templated so I can match site design. There needs to be an indicator as to how long the download/upload will take.