Dynamically centering images in MC as they load

I am dynamically loading images into a movie clip (MC), but as they load the images load from the MCs registration point which is fine if you want the image to load in the top left side of the MC.

What I would like to be able to dynamically change the registration point of the image to the centre when it is loaded. I would expect you would have to change the registration point of the MC (as the image takes on the properties of the MC).

Basically I would like the images to load from the left, right, top middle, botton middle etc… so that per project I can dynamically change the above.

Here is an example of what I am trying to achieve. I have everything else down pat except the images positioning…

http://www.evb.com

In the above case the images are loaded and their centre point becomes the centre of the image and the frame then expands or contracts depending on the image width and height.

Even if I could be able to make the centre point in the middle would do me…

Can anyone help???