Duplicating movie clips

ok
i have a problem with duplicating movie clips
i created a simple animation of ONE firework going up and then exploding.
now

i duplicated that movie clip ten times with a do-while loop. i placed the do-while loop AS in frame 1. and i wrote some action script on the actual firework movie clip, that will randomly scale and place the firework clip randomly along the x axis.

when i test it. 10 movie clips of the firework pop up and do its animation. thats all good…but how do i get it to do continuous duplication. so like right after it does its first 10. it will do anohter 10…and be random all over again…can i make it so i goes up one at a time?

if you need my fla file…just ask for it. i’ll attach it in the next reply