AS2 flash uploader?

im working on a website for a friend, and he wants me to create a file uploader for him so registered users can upload image files. they dont have to go into a gallery or anything, just into a directory for him to be able to download himself later.

now heres the problem, he wants the site 100% in flash. im capable of building basic flash websites - all the simple stuff, preloaders, sizing, navigation, external files, galleries, etc. but when it comes to uploading files and registered users im clueless.

what i need to know is, how long will this type of thing take to learn, how hard is it? and if anything could point me to some good links, maybe some tuts. normally i would outsource but im not charging for this and seeing as its just a mock i dont want to drop any cash on it yet.