ActionScript 2.0 :: Advanced HitTests With Any Of The "mc1" , "mc2" Etc?

I currently have a file that pulls out instances of a movieclip from the library and has them move across the screen. It names them "mc1" , "mc2" , etc, and the number is controlled by a variable. I also an on click event which attaches a movieclip to the stage in the same manner. this clip then moves down the stage. Each time the user clicks, it checks that there are less than the max of that movieclip, and if so it then sends down another instance. I want these movieclips to be able to hitTest with any of the "mc1" , "mc2" etc, but i can't seem to get it right. Also, i want it to reset the variable, b, which is used to name the movie clip the moves down the stage.
This is how i attach the bomb movieclip.

Code:
if (b<=bombs) {
attachMovie("bomb", "bomb"+b, (i+b));
bomb = _root["bomb"+b];
b += 1;

Now, how can I make each bomb able to hitTest with any of the "mc1", "mc2" etc that it may encounter, and what is a good way to reset b so that i keep the instance names "bomb1" , "bomb2" etc. I thought of just using a hitTest for each bomb instance, but I wanted to be able to add bombs at a later point if i wanted by simply changing the bombs variable.