scaleX, scaleY Tween on imported File

programming flash
1

I’m using a tween on an imported file on MOUSE_OVER and MOUSE_OUT that will scale it X/Y up by 1.2. The problem is that the scaling starts in the upper left hand corner and moves out from that point. I want the scaling to start from the center.

Any ideas?

new Tween(clipT,"scaleX",Elastic.easeIn,this.scaleX,1.2,.5,true);
new Tween(clipT,"scaleY",Elastic.easeIn,this.scaleY,1.2,.5,true);