3 'tellTargets' to one target

i am attempting to control a movieclip using the rollover function of a button (which is also a movieclip due to an animated button). I have tried the tellTarget command (which works one one button), but applying this to more than one button seems to render the tellTarget command useless. can anyone suggest a different approach, or explain how this should be done corectly.

My scripting skills are pretty basic, so i may have missed something obvious. I apologise if I have.

the code used is as follows, and is pasted onto all three buttons:

onClipEvent (enterFrame) {
if (this.hitTest(_root._xmouse, _root._ymouse, true)) {
this.nextFrame();
tellTarget(_root.onlineportfolio){
nextFrame();}

} else {
this.prevFrame();
tellTarget(_root.onlineportfolio){
prevFrame();}
}
}

I have uploaded my .fla (mx2004) as I am awful at explaining my problems. (the buttons are in menu1 movie clip, and the animation is in onlineportfolio movie clip).

If anyone could help, it would be very much appreciated.

sifu