gistfile1.txt

// form posts to a different url
  // change 'subscribe' callback to 'unsubscribe'
  // change loading
  var form_element = obj.down('form');
  var onsubmit = form_element.getAttribute('onsubmit').toString();
  var onloading = 'onLoading:function(request){subscription_loading_unsubscribed(\'' + container_id + '\')}';
  var new_onsubmit = onsubmit.gsub(/'\/subscriptions\/[\d]+'/, "'\/subscriptions'").gsub(/\{unsubscribe\(/, '{subscribe(').gsub(/onLoading:function\(request\)\{[^}]+\}/, onloading);

  form_element.setAttribute('onsubmit', new_onsubmit);