Button nested in movieclip to load img - Help

1

I have a 2 movieClips on stage. One is a holder to load the images into, the other has buttons nested inside. The button will not load the image.

Here’s the code:

btn1.onRelease = function() {
holder.loadMovie(“one.jpg”);
}

I’m sure that it’s due to _root or similar but I’m not too sure how to apply it properly if so. I’ve attached the .fla and would really appreciate the help.