// line 272 and following - seems to work for me, at least i can drag across multiple tbodys

if (movingDown && jQuery.tableDnD.dragObject != currentRow) {
  currentRow.parentNode.insertBefore(jQuery.tableDnD.dragObject, currentRow.nextSibling);
} else if (! movingDown && jQuery.tableDnD.dragObject != currentRow) {
  currentRow.parentNode.insertBefore(jQuery.tableDnD.dragObject, currentRow);
}