counter.js

var counter_list = [10,10000,10000];
var str_counter_0 = counter_list[0];
var str_counter_1 = counter_list[1];
var str_counter_2 = counter_list[2];
var display_str = "";
var display_div = document.getElementById("display_div_id");

function incrementCount(current_count){
  setInterval(function(){
    // clear count
    while (display_div.hasChildNodes()) {
        display_div.removeChild(display_div.lastChild);
    }
    str_counter_0++;
    if (str_counter_0 > 99) {
      str_counter_0 = 0; // reset count
      str_counter_1++;    // increase next count
    }
    if(str_counter_1>99999){
      str_counter_2++;
    }
    display_str = str_counter_2.toString() + str_counter_1.toString() + str_counter_0.toString();
    for (var i = 0; i < display_str.length; i++) {
      var new_span = document.createElement('span');
      new_span.className = 'num_tiles';
      new_span.innerText = display_str[i];
      display_div.appendChild(new_span);
    }
  },1000);
}