Code problem, i guess... SOS!

Hi there… i am trying to duplicate a movie clip that is inside of another movie clip.
BUT it doesnt work.
the movie clip is mc_b that is inside of mc_allspots. I would like to duplicate the same movie clipt inside of the mc_allspots movie clip…
Any idea>?

THANKS!
Cheers.

Here is the code.


for (j=0;j < 85;j++) //alt
  {
    for(i=0;i < 90;i++)  //base
    {
     duplicateMovieClip(mc_allspots.mc_b, "mc_allspots.mc_b_" + p, mc_allspots.getNextHighestDepth());
     mc_allspots["mc_b_" + p]._y = p_y;
     mc_allspots["mc_b_" + p]._x = p_x;
     //_root["mc_b_" + p]._alpha = 0;
     p_x=p_x+10;
     p++;
    }
    p_x = 32;
    p_y= p_y+10;
  }