Vertical centering/cutting off top

is there a way to have your swf vertically centered and not cut off the top when the screen is resized? right now, it makes my navigation bar not viewable…which is a big problem. i tried Stage.align = “T”, but that doesn’t seem to help. i don’t want it to resize, i just want it to be centered vertically if there is enough room to do so, but if not, then just go as high as possible and have the user scroll down to see the rest.