File manager 2(Joomla, PHP, MySQL, JavaScript)

We need to build a file manager (sometimes called as a file browser). We need it to be build on the Joomla CMS as the component(s) (the best solution for us). If You do not know Joomla CMS then You can build the project as the stand-alone web aplication (worse solution, but also acceptable). We will find other person for put Your stand-alone version into Joomla CMS. The most of file browsers I saw on the web are not so attractive for the average user to use. We pay our attention to user-friendly solutions only. User-friendliness is the goal for us. Functionality is the requirement for us. Technologies included: PHP (5.3(+)), MySQL (5.1.41(+)), any other value we can use on a dedicated server. You can also legaly use any third part extension if You feel the need for this. We need the file browser to be done. The Joomla version we will use - 1.5.23. The use of MVC pattern is the advantage for all developers. The key feature is drag & drop files and folders from the computer to the file file browser. Dragged folders can have some more folders and files inside. We have few days for You to work on this project. Tell us what You can do in those few days. It is clear for all of us that OS style file browser cannot be made from scratch in one week. However, we want the maximum from what we can get in "as soon as possible". The best You can do for now is to draw the approximate milestone and tell us how much money each of the period would cost for us. The project will be updated with some specific details about: - database tables (names, structure, etc.), - files (file system, structure of folders, etc.), - relations with other Joomla components (e.g. com_user).