Removing an attachMovie()'d clip?

I’m working on a project where, when the user the clicks a button, a “window” shows up, by loading a clip from the libray, using _root.attachMovie(“window_mc”, “window_mc”, 0). I’d like the user to be able to “close” the window, yet I’m not sure how to script a button inside the clip to close its parent clip, the “window.”