ActionScript 2.0 :: Getting Flash Form To Work?

I'm in the process of building a flash form I've been following tutorial:

[URL]

But I've made a change to the work layout (details below) and now I can't get my:

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

ActionScript to work so when you press the send button on the form page the play head doesn�t advance to the thank you frame.

In the tutorial shown all the frames are on the main timeline. Because of existing content layout in the site I�m building this form for I have to build the same form and placed it in a movie clip aptly named "form" so it will occupy only one frame on the main timeline.I think the problem lines in the:

_root.nextFrame();

Part should it be a:

this.nextFrame();