uploading via applescript?

I’d like to be able to upload an MP3 file using applescript, but am not sure if this is possible to hit the PHP script for uploading properly. I noticed when I look at the source of the html page for post.php that there is a number that is apparently generated when the page is loaded. I’m assuming I can’t just use any old number there and that it’s tied to the uploaded file in the database. Can this number be generated automatically and passed to the script? Is this even doable?