- Patch #179937 by quicksketch: made the table header magic more robust.  When a table disappears from the HTML, an error would otherwise be thrown.

#171866 by kkaefer and dvessel: prevent the tableheader script from running in IE less then v7, because of incompatibility

#134307 by dww, Stefan Nantegaal and dvessel: fix table headers interaction with Safari, so the fieldset contents will not disappear