Duplicating movie clips

i have a little problem with duplicating movie clips. I am a duplicate movie clip newbie, so i duno very much…anywayz…i create a movie clip of a circle just sitting there in the first frame with no other tween.

but then i add the duplication clip action, in then circle movie clip…now when i play, it does duplicate the movie clip, but it duplicates it and when it duplicates it again, it removes the movie clip it created…so like i got a bunch of circles appearing all over the place, but not staying. my code kinda looks like this

amount = 10;
while (amount<10)
duplicateMovieClip(_root.circle, “circle” + amount, amount);

yeaaah…any help?