AttachMovie randomly

I am looking help for attachMovie from the liabrary as follows:
I have five mc in the liabrary.

  1. attachMovie randomly from liabrary on a position. For example,by onPress of a button, one of the 5 mc is on stage at (100,100). That means by pressing the button, mcC may appear, by pressing the button again mcD appear, and so on randomly at (100,100).
  2. attachMovie randomly from library and place the mc on stage randomly. That means by pressing the button, mcB is appear on stage at any place, and by pressing the button, mcA appear and place at any place on stage and so on. I hope this is not confusing.