uploading a directory

Question

Is there any way to upload all the files in a directory on a end-users machine to a server? I can easily upload one file at a time but can't figure out how to upload all files in a directory. Idealy I would like to create a zip file containing the files and then upload that single zip file. Any ideas on that if it is even possible? Another idea that I had would be to upload the files one at a time. To do that I would need to know what files are in the directory. Is there a way to get a directory listing off of a user's machine? Any help is appreciated greatly!