manipulating loaded movies

I have the following to load a movie into my root movie. There is more
to it, but for reasons of clarity, I left not relating parts out.

var mainC = this.createEmptyMovieClip("mainContent",
this.getNextHighestDepth());

//here I create the movieclip loader object which works fine.


movieloader_mclListener.onLoadInit = function(target:MovieClip):Void{
mainC.gotoAndPlay("open_home");
}

movieloader_mcl.loadClip("../flash/bazzani_02.swf",mainC);


What does not work is the mainC.gotoAndPlay("open_home"); part. In the
testing environment it works good, but as soon as the flash file is
embedded in the html file it no longer works.

Any ideas why this would be?

Thank you for any help!
Brian