Flash AS2 programer (load xml gallery into template center_mc centered[without jump=resize browser]

Hello,
I am trying to load an external 1.swf that contains a xml gallery into center_mc.container_mc that is positioned in the center of the stage but an external .as file. I have had success when I make the container_mc have a graphic in it that is the same size as the incoming swf (this way when the browser is resized the loaded swf doesn't jump as the size of the mc changes) With the xml gallery the size of the element move depending on the images being loaded. I have tried to use a larger (than the gallery) graphic to keep the gallery centered. but that didn't work. I guess the issue could be solved by the external .as file having some script that constantly positions the centre_mc in the middle of the stage. click information buttom at the bottom to test

Thanks,
Matt