<script class="jsbin" src="http://code.jquery.com/jquery-1.7.2.min.js"></script>

​

<style>

  .elements

  {

    border:1px solid;

  }

</style>

<div class="elements">

 <div class="class3">

 <input class="class1" type="checkbox" value="1" name="first" id="first" />

 </div>

 <div class="class3">

 <input class="class2" type="checkbox" value="1" name="second" id="second" />

 </div>

 </div>

​

​

<div class="elements">

 <div class="class3">

 <input class="class1" type="checkbox" value="1" name="first" id="first" />

 </div>

 <div class="class3">

 <input class="class2" type="checkbox" value="1" name="second" id="second" />

 </div>

 </div>