title: Mootools appending html after an ajax request
body: <p>I have an ajax call that looks like this, </p>
  
  <pre><code>    $('campaignType').addEvent('change', function(){
    alert($('campaignType').value);
    var request = new Request({
     method: 'get',
     url: '/admin/admin_' + $('campaignType').value + '.php',
     onRequest:function() {
      alert('Request has been made, please be patient')
     },
     onComplete:function(response) {
      $('campaignForm').append(response);
     }
    }).send();
   });
  </code></pre>
  
  <p>Essentially what happens is depending on what the value of `$('campaignType') some HTML is returned from another file, however I cannot seem to get the HTML to append on to my container. Any one care to give me some advice?</p>
  
  <p>Thanks</p>