How to load another flash movie in the main movie?

hi,

i have 3 SWF files, lets call them A, B and C.

A is the main movie.
When i click on a link in A, a blanc movieclip is created within A and the content of the movieclip is B.

Now what i would like to do is, when i click on a link in B, load C into the main A (so C should replace B in the main movie A).

How should i proceed?

many thanks!

Matt