anchor.diff:        <%= link_to (raw("<i class='icon-edit'></i> <span class='hidden-tablet hidden-phone'>")) + t('document.actions.edit')+ raw("</span>"), '#document-edit', 'data-toggle' => 'tab' %>
       </li>
       <% end %>
  -    <%if document.class==Video%>
  +    <%if document.class==Video || document.class==Audio%>
         <li class="<%= document_details_tab_class document, :embed %>">
             <%= link_to (raw("<i class='icon-code'></i> <span class='hidden-tablet hidden-phone'>")) + t('excursion.actions.embed')+ raw("</span>"), '#document-embed', 'data-toggle' => 'tab' %>
         </li>
  
positive.code:     <div class="tab-pane <%= document_details_tab_class document, :embed %>" id="document-embed">
        <p><%=t("document.embed_explanation")%></p>      
        <div class="contentembed">
            <textarea class="shortUrl" readonly="true" rows="5" id="textarea_for_iframe" type="text">
             &lt;audio controls&gt;
             &lt;source src="<%= audio_url(document, :format => :webm) %>" type="audio/webm"&gt;
             &lt;source src="<%= audio_url(document, :format => :webm) %>" type="audio/webm"&gt;
             Your browser does not support the audio tag.
             &lt;/audio&gt;
            </textarea>
  
            <button class="btn " id="btn_copy_embed" href="#" data-toggle="tooltip" data-placement="right" title="<%=t('copy_to_clip')%>">
  
              <i class="icon-copy large"></i>
            </button>
  
negative.code: <%if document.class==Video || document.class==Audio%>
    <%=javascript_include_tag "jquery.zclip.min" %>
    <script type="text/javascript">
      $(document).ready(function(){
  