Resizing invisible buttons?

I’m loading jpegs dynamically and have an invisible button over top to cycle through them, but I can’t seem to get the “hit” part of the button to resize. Here’s my code:

var myMCL = new MovieClipLoader();

myMCL.loadClip(“images/db/body/”+imgLoad.imgLocal,"_root.holder1.chapter1.holder2.combo1.imgHolder");

myMCL.onLoadInit = function(targetMC) {
[indent]imgHit._x = targetMC._x;
imgHit._y = targetMC._y;
imgHit._width = targetMC._width;
imgHit._height = targetMC._height;
[/indent] }
where “imgHit” is the instance of my button;
the image loads no problems and a few other bits of code I have (resizing and centering) work fine… but I can’t get the button resized… any tips?

cheers