anchor.diff:              oldfield.up().appendChild(oldfield);
               oldtab.up().appendChild(oldtab);
               Effect.Appear(oldtab, {duration: 0.25});
  -            }
           });
           
           // deselect all tabs
  
positive.code:             oldtab_index = oldfield.up().childElements().indexOf(oldfield) + 1;
              oldtab = content.down('li', oldtab_index);
              
              if ($F(oldfield) == "") {
                  oldfield.remove();
                  oldtab.remove();
              } else {
  
                  // if droppable is DEFAULT then add its content to any blank, then remove.
                  if (oldtab.hasClassName('default')) {
                      clean_defaults(content, oldfield, oldtab);
                      
  //                    newfields = content.select('input,textarea');
  //                    newfields.each(function(newfield) {
  
negative.code: //                    oldfield.remove();
  //                    oldtab.remove();
                      
              } 
                  
              oldfield.enable();
              oldtab.addClassName('warning');
  