/**
 * Callback to add field to form when link is clicked
 */
function removeFormField(id) {
  $(id).remove();
}
 
/**
 * Callback to add field to form when link is clicked
 */
function addCategoryField(parentId, strField) {
  var idx = $(parentId).data('idx');
  strField = strField.replace(/@@/g, idx.toString());
  $(parentId).append(strField);
  $(parentId).data('idx', idx + 1);
}