Scale Moveclip from center registration

programming flash
1

Greetings,

I am using a slider component to scale a movie clip. Currently it scales from the bottom right corner (I guess this is default). I would like the MC to scale out from the center. Any help provided would be greatly appreciated.

Best,
JTC

Current Code

// slider

slider.addEventListener(SliderEvent.CHANGE, scaleObject);
slider.minimum = 1;
//setting default slider thumb’s position
sliderpent.value = 5;
sliderpent.liveDragging = true;

// scaling functon

function scaleObject(e:SliderEvent):void{
holder_mc.scaleX = e.target.value / 5;
holder_mc.scaleY = e.target.value / 5;
}