if (aValue < 0)
if (aValue < -1) {
nsHTMLTableRowElement::DeleteCell(PRInt32 aValue){  if (aValue < 0)    return NS_ERROR_DOM_INDEX_SIZE_ERR;    nsCOMPtr<nsIDOMHTMLCollection> cells;  GetCells(getter_AddRefs(cells));  nsCOMPtr<nsIDOMNode> cell;  nsresult rv = cells->Item(aValue, getter_AddRefs(cell));  NS_ENSURE_SUCCESS(rv, rv);  if (!cell) {    return NS_ERROR_DOM_INDEX_SIZE_ERR;  }  nsCOMPtr<nsIDOMNode> retChild;  RemoveChild(cell, getter_AddRefs(retChild));  return NS_OK;}