Align to stage when resizing

Hello fellow humans,

I need to know how to align a _mc to the bottom of the stage no matter how large or small the browser is stretched.

right now I’m using this script to change the purpotions of a mc.
topstretch._width = Stage.width;

I know it must be close to the script used above I just cant find anything on the world wide web to tell me more.

Any help would be rad!