I realize I am not answering your question here exactly, but this might make your user experience a little better. If you are uploading any number of files I would suggest creating a zip file or tar gzip, whatever, of all the files and uploading them as a single file, and coding your script to extract them.

The main reason I suggest this is that if you want more than a small handful of files going through the html file selection method is a real pain. It's real easy to support on the script end, too. Man, I wish walmart would allow that for their one hour photo uploads.