Center loaded movieclip

Hi everybody,

I have the code below, and I am using it to load an external mc. I would like the loaded movie centered on the stage, but I can’t find a way to do it. Could anyone please help me?

Thanks


var movieLoader:MovieClipLoader=new MovieClipLoader();
var loaderL:Object = new Object();
loaderL.onLoadInit= function(target_mc:MovieClip){
    target_mc._x=Stage.width/2 - target_mc._width/2;
}
movieLoader.addListener(loaderL);
movieLoader.loadClip("main.swf", holder_mc);