REVscene Automotive Forum - Flash ActionScript Help Please

Hello everyone. I've been trying to get this working for the past month. I searched as much as I could and everywhere that I could. Please help with my situation.

I'm loading external swf files to a movie container, but I want to show a preloader before it is ready and play. The problem is the preloader get stop prematurely and there is a gap between the preloader stopping and the movie playing.

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BUTTON: (note that button is not on _root, but within containers after containers, and it will be extremely difficult to redo all that animation work)
on (rollOver, dragOver) { //as2 on button
gotoAndPlay(2); //animation of the button
_root.PrevCon._visible = false; //make movie container invisible
loadMovie("path here", _root.PrevCon); //load movie to container
_root.PreLoadCon.gotoAndStop(2); //frame 2 of preloader container plays it
}
on (rollOut, dragOut) {
gotoAndStop(1); //animation of the button
unloadMovie(_root.PrevCon); //unload movie from container
_root.PreLoadCon.gotoAndStop(1); //frame 1 of preloader container stops it
}
//this part is irrelevant but i purposely dun load it on release
on (release) {
_root.pro_btn.gotoAndPlay(2);
_root.gotoAndPlay(3);
}
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MOVIE CONTAINER: (aka PrevCon)
onClipEvent (enterFrame) { //as2 on movie clip
if (this.getBytesTotal != 0) { //if something is loaded
if (this.getBytesLoaded() == this.getBytesTotal()) { //if it's complete
_root.PreLoadCon.gotoAndStop(1); //preloader animation stops
_root.PrevCon._visible = true; //movie is visible
}
}
}
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PRELOADER CONTAINER: (aka PreLoadCon)
No script except stop() on frame 1 and 2 on action layer, and on animation layer frame 1 is clear and frame 2 has self play animation that keeps on looping.
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Any help to solve this would be greatly appreciated. It has been many restless nights after work.

Cheers~