loadMovie Hierarchy Problem

[AS]
_root.onEnterFrame = function() {
if (this._currentframe == 2) {
_root.prevButton._alpha = 30;
} else if (this._currentframe == 9) {
_root.prevButton._alpha = 30;
} else {
_root.prevButton._alpha = 100;
}
if (this._currentframe == 8) {
_root.nextButton._alpha = 30;
} else {
_root.nextButton._alpha = 100;
}
_root.frameCount = (_root._currentframe-1)+"/"+(_root._totalframes-3);
};
[/AS]

I have the following code in the main timeline of a movie. This script works perfectly as is, given that I am not using loadMovie and am directly viewing the movie from the fla. However when I try to use loadMovie to load the swf into an empty movie clip in a different movie, it no longer works. I assume this is because I am missing a _root or _parent somewhere. Could anyone tell me what exactly I am missing, what I need to modify in order for the script to work with loadMovie?

Thanks,

Fargate