Resize MC with easing from center

Hi

I have been creating an XML gallery now got to showing the big images part. I want to create a resizing background (like at http://www.bearfootfilms.com/). I can create the effect but it always resizes from the top left not center.

Any one got any ideas?

I’m using the code:

var VTween = new Tween(picbg, “_width”, Strong.easeInOut, 100, currentImage.largepicholder._width+20, 1, true);
var HTween = new Tween(picbg, “_height”, Strong.easeInOut, 100, currentImage.largepicholder._height+20, 1, true);