Multishoot on Multytarget

programming
1

my ship game have multishoot to multi targets,
but some shoots don’t hit targets

function ship_generator(num_ships){
 
 //timespawn=720/num_ships*20;
 timespawn=3000;
 trace("TimeSpawn :"+timespawn);
 setInterval(spawn_ship,timespawn);
 
}
function spawn_ship(){
 //if(j==null){j=-1;}
  j =(j==null)? -1 : j;
  j++;
  
  rand_ship_type=random(3);
  _root.b_ship++;
  //trace("rand"+rand_ship_type);
  
  switch (rand_ship_type){
  case 0 : 
   ship_type="bship"; 
   break;
  case 1 : 
   ship_type="fighter";
//    trace("you pressed 1"); 
   break;   
  case 2 : 
   ship_type="bomber";
//    trace("you pressed B"); 
   break;
  }
  
  //var ShipHolder: = new myship();
  
  trace("Ship :"+j+"  TYPE:"+ship_type);
  deep=j+16000;
  attachMovie("mc_"+ship_type,"ship"+j,deep);
  //attachMovie("mc_fighter","ship"+j,deep);
  ship=_root["ship"+j];
  ship._x=550;
  ship._y=250;//Math.random()*200;
  ship.velx=-Math.random()*8+2;
  ship.vely=0;//Math.random()*4;
  
  ship.onEnterFrame = function() {
   
   this._x+=this.velx;
   //this._y+=this.vely+Math.random()*2;
   _root.acerta(this);
   _root.onScreenShip(this);
   }
  
}

_root.acerta is the function that test de hittest

function acerta(objecto){
 //trace(" FUK acerta "+objecto+" ");
 if(objecto.hitTest(_root.my_ship)==true){
  trace(objecto+" Hit MySHIP");
 }
    
 upper_bullet=_root.n_bullet+_global.max_Bullet;
 
 //trace(_root.n_bullet+"/"+upper_bullet);
 
 for(i=_root.n_bullet;i<upper_bullet;i++){
  bullet_ito=eval("_root.bullet"+i);
  if(objecto.hitTest(bullet_ito)==true){
   //trace(objecto+" HITED By bullet"+i);
   removeMovieClip(objecto);
   removeMovieClip(bullet_ito);
   _root.n_shipDestroi++;
   _root.n_INbullet--;
   _root.n_ship--;
  } 
 }
}

I cannot figure what’s wrong , i am gessing that when I fire more bullets the 1st miss target…

please check this for me

There’s any way I can do a better script… I mean the instead of the for go max bullets ( 16 ) it will just go on those that are on stage?

thaks