[MX2004] External JPGs & loadMovie()

I have 100 mc’s loading external thumbnail jpgs via loadMovie(). I need a preloader of some sort to show the status of the thumbnails. The problem is that each of the mc’s are loading JPG individually and I am not sure of how to combine their loading statuses into a preloader. The other option I had planned to use was to make one thumbnail larger in file size than the others so that it would load last and therefore I could use some onload function for this particular thumbnail, but I do not know what would be best to use in this case.

Any help/suggestions are greatly appreciated.