Random image + fade in WHILE fadeing out

Hi, I wanted to do this effect…

  1. The movie randomly selects an image i imported to the Library. (eg. pic1_mc, pic2_mc, pic3_mc)

  2. Then, I wanted the chosen pic (eg. pic3_mc) to fade in.

  3. After a period of time, say 30 secs, The movie selects another pic randomly, say, pic2_mc, then, here comes the part: I want to fade in *this chosen image (pic2_mc) *WHILE the previous pic (pic3_mc) fades out.

  4. This animation then loops.

I tried using an array to generate the images randomly, it works… But i have problems with the fade-in WHILE fade-out…