The DOM Level 2 document <http://www.w3.org/TR/DOM-Level-2-HTML/html.html#ID-13114938
> says that deleteRow(-1) deletes the last row.
The current HTML 5 draft <http://www.whatwg.org/specs/web-apps/current-work/#deleterow
> does not mention -1 for deleteRow, only for insertRow.
I think HTML 5 should be revised.
-- Darin