Centering an attachMovie in its holder

Hi All - anyone know how to center an image that is smaller than its attachMovie parent. Basically I have a blank slide (a 94 x 94 square) that I load dynamically image thumbnails into. Some of them may be 92 wide and others 92 tall but never anymore than that. The problem I have is that all images loaded are aligned to the top of the mc they replace and if a thumbnail is 92 wide by 20 tall than theres alot of space underneath it - i need to center (both vertically and horizontally) the loaded data and I have come up stumped. Geniuses please apply - lol:rocker: