added check to iframe

app/templates/show_stack_detail.html

@@ -28,7 +28,11 @@
           <li>  <a href="{{url_for('show_book_by_id', id=book.id)}}">{{book.title}}</a> </li>
           <img class="no_cover" id="{{ book.title }}" src="../cover/{{ book.cover }}" width="150" onerror="if (this.src != '../cover/{{ book.cover }}') this.src = '../static/img/default_cover.gif';">
 <div class='widget'>
+  {%if light%}
+  {%else%}
           <iframe src="../uploads/{{ book.file }}" width="50%" ></iframe>
+          {%endif%}
+
 </div>