How to create a virtual pool of movie clips that will be used in the future?

I am creating a game where enemies are spawned from the library onto the stage. Instead of spawning new enemies, I want to be able to have 20 enemies already made in a "virtual" pool. These enemies will get spawned randomly, and when the player clicks on the enemies, they die and get recycled instead.  This is my loop code to create enemies:

function makeEnemies():void
{
          var chance:Number = Math.floor(Math.random() * 150);
          if (chance <= level && enemies.length < 4)
          {
                    tempEnemy = new Enemy();
                    tempEnemy.x = Math.round(Math.random() * 480);
                    addChild(tempEnemy);
                    tempEnemy.scaleX = 1.5;
                    tempEnemy.scaleY = 1.5;
                    tempEnemy.cacheAsBitmapMatrix=identityMatrix;
                    enemies.push(tempEnemy);
                    tempEnemy.speed = enemyBaseSpeed + ((level - 1) * speedLevelInc);
                    if (tempEnemy.speed > MAX_SPEED)
                    {
                              tempEnemy.speed = MAX_SPEED;
                    }
          }
}
function moveEnemies():void
{
          var tempEnemy:MovieClip;
          for (var i:int =enemies.length-1; i>=0; i--)
          {
                    tempEnemy = enemies;
                    if (tempEnemy.dead)
                    {
                              score++;
                              score++;
                              roachLevel.score_txt.text = String(score);
                              enemies.splice(i,1);
                    }
                    else
                    {
                              tempEnemy.rotation += (Math.round(Math.random()*.4));
                              tempEnemy.y +=  (Math.cos((Math.PI/180)*tempEnemy.rotation))*tempEnemy.speed;
                              if (tempEnemy.x < 10)
                              {
                                        tempEnemy.x = 11;
                              }
                              if (tempEnemy.x > stage.stageWidth - offset)
                              {
                                        tempEnemy.x = stage.stageWidth - offset;
                              }
                              if (tempEnemy.y > stage.stageHeight)
                              {
                                        removeEnemy(i);
                                        lives--;
                                        roachLevel.lives_txt.text = String(lives);
                              }
                    }
          }
}

I don't want to use classes. Just the code inside the layer.