I have created multi step form as below:

http://www.ryanwright.me/cookbook/drupal7/forms/multi-step

I need to transfer the same functionality to my template tpl.php file.

This is my code:

    <div class="row">         <div class="panel panel-default">             <div class="panel-heading main-color-bg">                 <h3 class="panel-title">Heading</h3>             </div>             <div class="panel-body">                 <div class="col-md-12">                   <?php print render($  form['firstname']); ?>                 </div>                 <div class="col-md-12">                   <?php print render($  form['submit']); ?>                 </div>             </div>         </div>     </div> <div class="row">     <div class="panel panel-default">         <div class="panel-heading main-color-bg">             <h3 class="panel-title">Heading</h3>         </div>         <div class="panel-body">             <div class="col-md-12">               <?php print render($  form['lastname']); ?>             </div>             <div class="col-md-12">               <?php print render($  form['back']); ?>               <?php print render($  form['next']); ?>             </div>         </div>     </div> </div> 

How can I split this form to different sections?