[j0hnik]

<button class="perk_border">But1</button>
<button class="perk_border perk_border_g pr_gr">But2</button>
<button class="perk_border perk_border_y">But3</button>
<div id="clicks"></div>
<script>

B=setInterval(function atak()
{ 
   document.getElementsByClassName("perk_border")[0].click(); 
   document.getElementsByClassName("perk_border perk_border_g pr_gr")[0].click();

   if(++i % 10 == 0) { 
      document.getElementsByClassName("perk_border perk_border_y")[0].click(); 
   }
},2500), i = 0;


document.getElementsByClassName("perk_border")[0].onclick = function() { clicks.innerHTML += "1"};
document.getElementsByClassName("perk_border perk_border_g pr_gr")[0].onclick = function() { clicks.innerHTML += "2" };
document.getElementsByClassName("perk_border perk_border_y")[0].onclick = function() { clicks.innerHTML += "3" };
</script>

С Dilettante