Resizing attachMovie clips [help]

i have an mc called content_mc and it attachs different movies depending on the button which ‘called’ it i am using this command to attach the movie -


stop();
_root.oldMClip = _root.fromName + "2";
attachMovie(_root.fromName, _root.oldMClip, 1);

I was wondering how do i resize the clips so they are same size and the content_mc?