anchor.diff:      $event = $('#event'),
       $event_link = $('#event_link');
   
  -  function disableElements(selectors) {
  -    $.each(selectors, function() {
  -      this.css('visibility', 'hidden');
  -    });
  -  }
  -
  -  function enableElements(selectors) {
  -    $.each(selectors, function() {
  -      this.css('visibility', 'visible');
  -    });
  -  }
  -
     $event_type.change( function() {
       var event_type = $(this).val();
       if (event_type) {
  -      enableElements([$event]);
  +      $event.attr('disabled', false);
         $.getJSON(event_type+'.json', function( data ) {
  -        var items = ['<option value="">Please select an event</option>'];
  +        var items = ['<option value=""></option>'];
           $.each(data, function( idx, obj ) {
             items.push(
               "<option value='" + obj.value + "'>" + obj.text + "</option>");
  
positive.code: 
    <div class="row-fluid">
      <div class="span4">
        <%= select_tag(:event_type, options_for_select([
          ['Please select an event type', ''],
          ['Cites Animal Committee', 'cites_acs'],
          ['Cites Plant Committee', 'cites_pcs']
        ])) %>
      </div>
      <div class="span4" >
        <select id="event" name="events" style="visibility: hidden"></select>
      </div>
      <div class="span4">...</div>
    </div>
  
    <div class="row-fluid">
      <a href="" id="event_link" style="visibility: hidden">
        Go to event upload document page
      </a>
    </div>
  
negative.code:         $('#event').html(items.join( "" ));
        });
      } else {
        $event.attr('disabled', true);
        $event_link.css('visibility', 'hidden');
      }
    });
  
    $event.change( function() {
      var event = $(this).val();
      if (event) {
        $event_link.attr('disabled', false);
        $event_link.css('visibility', 'visible');
        $event_link.attr('href', 'events/'+event+'/documents');
      } else {
        $event_link.css('visibility', 'hidden');
      }
    });
  
  