How to Center loadMovie Registration Point

Hello Flash Tech’s,
I really having trouble figuring this one out.
I’m trying to use Zoom transition for my photo Gallery which I’m using loadMovie “jpg” from Xml file.
**Now the problem is here. **
The Registration Point is set to the top upper left corner and I would like it to be in the center of my loadMovie.
The Zoom transition only zoom from left corner and need to be center equal sides.
How do I do this. My image size is "width 400px height 240px