Depth issue

Hi there. I finish my first intent of a game. Here is the link www.bandinopla.com.ar/Games.htm the last one.

A big problem that the game have is the depth management (sorry my english)
In the game, I duplicate moviClips like the bullets and the rocks falling. And there is a point where… when I use the:

depth.conter++; x.attachMovie(…,…, depth.conter++)

… the problem appears, a trace alert that say: the 225 levels… I dont remember exactly, but I wess you know what I talking about.

OK, the question: Somebody know a good tecnic to manage the depths in a game where a lots of .attachMovie is required… like in games of shooting stuff?

OK. thanks.

PD: Senocular RULES!!