Flash upload

I’ve been looking at the tutorial on creating an uploader in flash

(http://www.kirupa.com/developer/flash8/uploading_fileReference_pg1.htm)

and would like to be able to add some extra text fields, for title, description, etc. I can’t work out the correct way to send the entered text from the fields to the php script using the coding method used in this tut. Can anyone help?