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<!--  
mail icon: <span class="glyphicon glyphicon-envelope"></span>
text or html can go where it says text-or-html , it will show on the left and right side respectively

this template file is located at :
/app/design/frontned/your-theme/default/template/newsletter/subscribe.phtml
-->

<div class="block block-subscribe">
  <form action="<?php echo $this->getFormActionUrl() ?>" method="post" id="newsletter-validate-detail">
    <div class="input-group"> <span class="input-group-addon"><?php echo $this->__('text-or-html on left') ?></span>
      <input type="text" class="form-control input-sm required-entry validate-email" title="<?php echo $this->__('Sign up for our newsletter') ?>" id="newsletter" name="email">
      <span class="input-group-btn">
      <button class="btn btn-default btn-sm" title="<?php echo $this->__('Subscribe') ?>" type="submit"><?php echo $this->__('text-or-html on right') ?></button>
      </span></div>
  </form>
  <script type="text/javascript">
//<![CDATA[
var newsletterSubscriberFormDetail = new VarienForm('newsletter-validate-detail');
//]]>
</script> 
</div>