another parallax script but for Bootstrap

body.html

<nav class="navbar navbar-default navbar-fixed-top">
  <div class="navbar-header">
    <button type="button" class="navbar-toggle" data-toggle="collapse">
      <span class="sr-only">Toggle navigation</span>
      <span class="icon-bar"></span>
      <span class="icon-bar"></span>
      <span class="icon-bar"></span>
    </button>
    <a class="navbar-brand" href="#">Title</a>
  </div>
  
  <!-- Collect the nav links, forms, and other content for toggling -->
  <div class="collapse navbar-collapse navbar-ex5-collapse">
    <ul class="nav navbar-nav">
      <li class="active"><a href="#">Home</a></li>
      <li><a href="#">Link</a></li>
      <li><a href="#">Link</a></li>
    </ul>
  </div><!-- /.navbar-collapse -->
</nav>

<!-- full image background container-->
<div class="bg"></div>

<section>

      <div class="row">
        <h1 class="text-center"><i class="icon-fire icon-3x"></i></h1>
        <h1 class="text-center"><strong>BOOTSTRAP PARALLAX EXAMPLE</strong></h1>
        <p class="lead text-center">A scrolling one page example layout</p>
      </div>
    
      <div class="row">
          <div class="col-md-4">
            <div class="text-center">
              <h1>Responsive</h1>
              <p>
              Take a look at what we mixed up in our Bootstrap test labs.
              Nullam sapien massa, aliquam in cursus ut, ullamcorper in tortor.</p>
             
              <button class="btn btn-primary btn-lg">Go Here</button>
            </div>
          </div>
          <div class="col-md-4">
            <div class="text-center">
              <h1>Front-end</h1>
              <p>
              Take a look at what we mixed up in our Bootstrap test labs.
              Nullam sapien massa, aliquam in cursus ut, ullamcorper in tortor.</p>
             
              <button class="btn btn-primary btn-lg">UI/UX</button>
            </div>
          </div>
          <div class="col-md-4">
            <div class="text-center">
              <h1>Design</h1>
              <p>
              With all of the front-end frameworks at hand, why does Bootstrap lead? 
              Aliquam mauris arcu, tristique a, condimentum feugiat justo.</p>
              
              <button class="btn btn-primary btn-lg">Go There</button>
            </div>
          </div>    
    </div>
</section>

<section>
      <div class="row">
       <div class="col-md-12">
        <div class="col-md-5 col-md-offset-1">
          <div class="panel panel-default">
           <div class="panel-heading">Title</div>
           <div class="panel-body">Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, 
            totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae vitae 
            dicta sunt explicabo. Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia cor magni dolores 
            eos qui ratione voluptatem sequi nesciunt. Neque porro quisquam est, qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit, 
            sed quia non numquam eius modi tempora incidunt ut labore et dolore magnam aliquam quaerat voluptatem. 
            Ut enim ad minima veniam, quis nostrum exercitationem ullam corporis suscipit laboriosam, nisi ut aliquid ex ea commodi consequatur?</div>
          </div>
        </div>
        <div class="col-md-5">
          <div class="panel panel-default">
           <div class="panel-heading">Title</div>
           <div class="panel-body">Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, 
            totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae vitae 
            dicta sunt explicabo. Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia cor magni dolores 
            eos qui ratione voluptatem sequi nesciunt. Neque porro quisquam est, qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit, 
            sed quia non numquam eius modi tempora incidunt ut labore et dolore magnam aliquam quaerat voluptatem. 
            Ut enim ad minima veniam, quis nostrum exercitationem ullam corporis suscipit laboriosam, nisi ut aliquid ex ea commodi consequatur?</div>
          </div>
        </div>
      </div>
    </div>
</section>
<section>
    <div class="row">
      <div class="col-md-12">
        <div class="col-md-4">
        <h2>Build</h2>
          Bootply is a playground for Twitter Bootstrap.
        </div>
        <div class="col-md-4">
        <h2>Design</h2>
          Use Bootply to design, prototype, extend the Bootstrap framework.
        </div>
        <div class="col-md-4">
        <h2>Test</h2>
          Use Bootply to test and debug Bootstrap designs.
        </div>
      </div>
      </div>
</section>
  
<section>
  <div class="row">
    <div class="text-center">
      <a href="http://www.bootply.com"><i class="icon-facebook icon-3x"></i> </a> &nbsp; 
      <a href="http://twitter.com/bootply"><i class="icon-twitter icon-3x"></i></a> &nbsp; 
      <a href="http://pinterest.com/in1"><i class="icon-pinterest icon-3x"></i></a>
    </div>    
  </div>
</section>
  


        
        <script type='text/javascript' src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>


        <script type='text/javascript' src="//netdna.bootstrapcdn.com/bootstrap/3.0.3/js/bootstrap.min.js"></script>

parallax-bs.txt

<script type='text/javascript'>
        
        $(document).ready(function() {
        
            $(window).scroll(function(e){
    parallax();
});

function parallax(){
    var scrolled = $(window).scrollTop();
    $('.bg').css('bottom',-(scrolled*0.1)+'px');
}

        
        });
        
        </script>