Код:

this.setBg = function()
{
  for (var i=0;i<this.images_source.length;i++)
  {
    _root['workspace_area'].createEmptyMovieClip('bg_image'+i,_root['workspace_area'].getNextHighestDepth());
    loadMovie(this.images_source[i],_root['workspace_area']['bg_image'+i]);
    _root['workspace_area']['bg_image'+i].width = this.images_width[i];
    _root['workspace_area']['bg_image'+i].height = this.images_height[i];
  }
}