Problem with contact form

i have followed and used the source for the following tut which is the flash based contact form using php

Everything worked fine i uploaded to my webspace and tested worked like a treat.
So what i have then done is loaded this contact form into a mc and now it stops working in that you can enter each of the fields that i have got no problem but as soon as i hit send button it does not move on to the sent screen, does anyone have any idea what is going on or not as the case may be.

thanks in advance