function loadCaption(filename, captionObject)
  {
      myRequest = new ajaxObject('./captions/' + filename);
      myRequest.callback = function(responseText, status) 
      {
        if(status == 200 && captionObject != undefined)
        {
          captionObject.innerHTML = responseText;
        }
      }
      
      myRequest.update('', 'POST');
  }