anchor.diff:      if (event_type) {
         $event.attr('disabled', false);
         $.getJSON(event_type+'.json', function( data ) {
  -        var items = ['<option value=""></option>'];
  +        var items = ['<option value="" disabled selected>Select your option</option>'];
           $.each(data, function( idx, obj ) {
             items.push(
               "<option value='" + obj.value + "'>" + obj.text + "</option>");
  
positive.code:         <div class="span5">
            Event type<br>
            <select id="event_type" name="event_type">
            <%= options_for_select([
              ['', ''],
              ['Cites Animal Committee', 'cites_acs'],
              ['Cites Plant Committee', 'cites_pcs'],
              ['Cites Technical Committee', 'cites_tcs'],
  
negative.code:         <div class="span4">
            Document type<br>
            <select id="document_type" name="document_type" disabled>
              <option value="" disabled selected>Select your option</option>
            </select>
          </div>
        </div>
  