[F8] box size in actionscript

[sonicFlasher]

So here's an issue that's got me stumped..

i'm creating a picture gallery in my flash document. when the user rolls over the thumbs (which reside on the stage), a larger image appears with a frame around it (both created and controlled in actionscript). the frame consists of a black box, bigger and in back of the image.

the actionscript resizes and places the box for each picture, since each image is a different size. this is my code:

//creates box
this.createEmptyMovieClip("largeBox", DepthManager.kTop);
	largeBox.beginFill(0x000000);
	largeBox.moveTo(10, 10);
	largeBox.lineTo(100, 10);
	largeBox.lineTo(100, 100);
	largeBox.lineTo(10, 100);
	largeBox.lineTo(10, 10);
	largeBox.endFill();

//defines image area
this.createEmptyMovieClip("image_mc", this.getNextHighestDepth());
var mclListener:Object = new Object();
mclListener.onLoadInit = function(target_mc:MovieClip) {
    
    //sets w&h relative to position on stage
    target_mc._x = 655-(target_mc._width/2);
    target_mc._y = 294-(target_mc._height/2);
	
    target_mc.setDepthTo(DepthManager.kTopmost);
	
     //positions box and sizes it relative to image
     largeBox._x = target_mc._x;
     largeBox._y = target_mc._y;
     largeBox._width = target_mc._width;
     largeBox._height = target_mc._height;
	
     //positions caption info
     captionsText._width = target_mc._width;
     captionsText._x = target_mc._x;
     captionsText._y = target_mc._y + target_mc._height + 7;
};

//sample thumb code
thumb01.onRollOver = function() {
	
	image_mcl.loadClip("portfolio_01.jpg", image_mc);
};

The problem is that the box is off-center from the image - by a very noticeable degree. Shouldn't this code position the box directly behind the image?

[sonicFlasher]

nevermind, i figured it out. it was an issue with the properties i gave the box when i created it.