[Dilettante_Pro]

arkadii_parovozov,
Не знаю, что у вас в массивах...

<style>
.select {position:relative;
            height:20px;
            width:20px;
            background-color:red
}
</style>
<div id='i1' class='select'></div>
<div id='i2' class='select'></div>
<div id='i3' class='select'></div>
<script>
var arr = document.querySelectorAll('.select'),
      arr_id = [],
      i;
for ( i = 0; i<arr.length;i++) {
     arr_id [i] = arr[i].getAttribute('id');
}
for ( i = 0; i<arr_id.length;++i) {
   document.getElementById(arr_id[i]).classList.remove('select');
}
</script>