Flash form on an external movie

I have completed the tutorial by senocular called “flash email form” found here :

http://www.kirupa.com/developer/actionscript/flash_php_email.htm

I got it to work properly like in the tutorial. But when I loaded my movie with the form (contact.swf) into my main movie (main.swf) something went wrong.

I belive it is the AC on my form MC:

onClipEvent(data){
_root.nextFrame();
}

_root. would be wrong in my case , wont it? What should I use instead?

Please help me!