How to find elements in an image grid?

Question

JavaScript

Hello!
There is a grid of images to which the "flip" animation is randomly applied.
The prototype can be viewed here dev.bakin.ru
All elements (squares) are stored in the timeouts object as properties:

(function() {
  ...

  var timeouts = []
      id = "timeoutID" + cardID;
  ...
    timeouts[id] = setTimeout(function() {
      var c = card.classList,
          newTime = randomNum( timeMin, timeMax ) * 1000;
      c.contains("flipped") === true ? c.remove("flipped") : c.add("flipped");
      cardsTimeout( id, newTime, card );
    }, time);
})();

The question is how to find 4 elements from the element indicated by the number "1" in the figure?
The element marked with the number "1" will also be determined randomly, so two areas are shown for clarity.
This is necessary so that later 4 pictures are replaced by one large picture that would occupy the area of ​​these 4 pictures.
Can you tell me if there is an algorithm or a solution for finding these elements, or maybe there is a plugin in general with which you can make such a grid.
Thanks in advance!