Should be easy, I must be overlooking something

I have a script I got from Revorg support; that I need help with a part of it: here is the original below.

_root.Wonder.createEmptyMovieClip (“wonderAD_mc”,0);
// This creates a movie clip to load an image in it

What I want to do is load it in the existing Movie Clip that on the stage instead of creating one…

The MC on stage is called wonderHolder.

Any help is great thank you…