Loading movies - a follow up Question

Hello Kirupa,
Back again with a new problem!
This time when i m loading a 2nd movie in 1st one in a transperent movie clip, the problem is that the sound incorporated in the 2nd movie continues to play ,thereby mixing up with the music of 1st movie…
Now how should i stop the sound in the 2nd movie just when it is preloading,and not afterwards.
Plsss help asap.Thanx in advance