for(Uint16 n = 0 ;n < bulletSprites.size(); n++) {
      if(bulletSprites.at(n).dir == MINUS)
        bulletSprites.at(n).y -= 7;
      else
        bulletSprites.at(n).y += 7;
                      
      bulletSprites.at(n).sprite->addToSurface(0, bulletSprites.at(n).x, bulletSprites.at(n).y);
      
      //Check if a bullet hits an Object
      if( (col = checkSpriteCollision(bulletSprites.at(n).sprite->getCurPosition(), bulletSprites.at(n).owner)) != -1 ) {
        
        printf("bullet = %i\n", bulletSprites.at(n).y + bulletSprites.at(n).sprite->getCurPosition()->h);
        printf("plane = %i\n", sprites.at(col).y);
        
        //Substitude the energie from the object
        sprites.at(col).energie -= bulletSprites.at(n).energie;

        //Buffer the bullerSprite
        Sprite bufSprite = *bulletSprites.at(n).sprite;
        
        //Remove the bulletSprite from the vector
        bulletSprites.erase(it);
        
        //Use the Buffer to draw a blank image of the bullet
        bufSprite.addToSurface(3, bufSprite.getCurPosition()->x, bufSprite.getCurPosition()->y);

        if(sprites.at(col).energie <= 0) {
          //If the sprite, that had been hit, has no energy left, then
          //start a thread, which animates the explosion, and removes
          //the object from its vector.
          if(col != 0)
            explodeThread = SDL_CreateThread(startExplode, &col);
          else
            explodeThread = SDL_CreateThread(startPlayerPlaneExplosion, &col);
        }
      } else {
        if(bulletSprites.at(n).y + bulletSprites.at(n).sprite->getCurPosition()->h >= 0 &&
           !bulletSprites.at(n).sprite->isOutOfScreen()){
          it++;
        } else {         
          //Buffer the bulletSprite
          Sprite bufSprite = *bulletSprites.at(n).sprite;
                    
          //Remove the bulletSprite from the vector
          bulletSprites.erase(it);
                    
          //Use the Buffer to draw a blank image of the bullet
          bufSprite.addToSurface(3, bufSprite.getCurPosition()->x, bufSprite.getCurPosition()->y);
        }
      }
    }