anchor.diff:        acceptFileTypes: /(\.|\/)(<%= settings.accepted_file_types.join('|') %>)$/i,
         maxRetries: 100,
         retryTimeout: 500,
  +      sequentialUploads: true,
   
         add: function (e, data) {
           var that = this;
  
positive.code: <head>
    <meta charset="utf-8">
    <title>File upload</title>
    <link rel="stylesheet" href="//ajax.googleapis.com/ajax/libs/jqueryui/1.10.4/themes/dark-hive/jquery-ui.css" id="theme">
    <link rel="stylesheet" href="/stylesheets/application.css">
    <link rel="stylesheet" href="/stylesheets/jquery.fileupload.css">
    <link rel="stylesheet" href="/stylesheets/jquery.fileupload-ui.css">
  
negative.code:     <div class="fileupload-progress">
        <!-- The global progress bar -->
        <div aria-valuenow="0" aria-valuemax="100" aria-valuemin="0" role="progressbar" class="progress ui-progressbar ui-widget ui-widget-content ui-corner-all">
          <div id="progressbar" style="width: 0" class="ui-progressbar-value ui-widget-header ui-corner-left"></div>
        </div>
      </div>
    </div>
  