private void initBombs(){             
        if(LEVEL > 3)            
            for(int i=0;i<(aliens.size());i++){
                stars = r.nextInt(1000-LEVEL*100);
                if(BOSSTRIG == true) stars -= 100;
                if(stars < LEVEL) {
                    AAlien a = (AAlien)aliens.get(i);
                    stars = r.nextInt(250);
                    bombs.add(new ABomb(a.getX()+stars,a.getY()));               
                }
        }
    }