Next and prev frame question... plz tell me whats wrong with this simple AS

Ok here is the AS i am having trouble with
[AS]
onClipEvent (enterFrame) {
if (this.hitTest(_root._xmouse, _root._ymouse, true)) {
_root.this.nextFrame();
} else {
_root.this.prevFrame();
}
}
[/AS]
I want to make it so when i roll over my movie clip (that i attach this AS to), a different movieclip is controlled. This AS
[AS]
onClipEvent (enterFrame) {
if (this.hitTest(_root._xmouse, _root._ymouse, true)) {
this.nextFrame();
} else {
this.prevFrame();
}
}
[/AS]
Works great, when using ‘this’ for the prev and next frame control but i cant figuire out how to control a different movieclip on root. Thanks a TON.

MIke