anchor.diff:    <% end %>
     <div class="skip"></div>
       <div id="epub" class="<%= @subdomain %>">
  -      <div id="reader"></div>
         <div id="mainContainer"></div>
       </div>
   
  
positive.code: 
    <script type="text/javascript">
  
      cozy.Control.Preferences.prototype._createPanel = function() {
        var self = this;
        if ( this._modal._container.querySelector('form') ) { return; }
  
negative.code:     // start reader
      reader.start();
  
      // distinguish these buttons from the links underneath, too much CSS to add otherwise, methinks
      var element = document.getElementById("viewThumbnail");
      element.classList.add("cozy-control", "button--lg");
  