Removing a movie clip and getting it back again. Help please

I have 2 MCs on the stage. I attach a movie to MC1 and do an _alpha tween on that by AS. After that, I use

MC1.swapDepths(1000); //just to have a value

After MC1 I do the same thing with MC2. It works removing the MC1.
If I want to do this as a loop, I remove MC2 as for the MC1.
Question: How can I get the MC1 back now?