<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<link href="//netdna.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//netdna.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<div class="container">
<div id="main_area">
<div class="row">
<div class="col-sm-6" id="slider-thumbs">
<ul class="hide-bullets">
<li class="col-sm-3">
<a class="thumbnail" id="carousel-selector-0">
<img src="http://placehold.it/150x150&text=zero">
</a>
</li>
<li class="col-sm-3">
<a class="thumbnail" id="carousel-selector-1"><img src="http://placehold.it/150x150&text=1"></a>
</li>
<li class="col-sm-3">
<a class="thumbnail" id="carousel-selector-2"><img src="http://placehold.it/150x150&text=2"></a>
</li>
<li class="col-sm-3">
<a class="thumbnail" id="carousel-selector-3"><img src="http://placehold.it/150x150&text=3"></a>
</li>
<li class="col-sm-3">