Problems with creating form in flash

hi!

I’m creating a form in flash based on the tutorial by senocular at http://www.kirupa.com/developer/actionscript/flash_php_email.htm

It works fine, but I would like to know how to attach files to the form, say if the form ask the user to submit his resume. Also, if I use a combo box, with multiple selections, how do I implement it within the form? Will it work with the email.php file? Many Thanks!