Return a new ``<p:tbl>`` element tree.

def new_tbl(cls, rows, cols, width, height, tableStyleId=None):
        """Return a new ``<p:tbl>`` element tree."""
        # working hypothesis is this is the default table style GUID
        if tableStyleId is None:
            tableStyleId = '{5C22544A-7EE6-4342-B048-85BDC9FD1C3A}'

        xml = cls._tbl_tmpl() % (tableStyleId)
        tbl = parse_xml(xml)

        # add specified number of rows and columns
        rowheight = height//rows
        colwidth = width//cols

        for col in range(cols):
            # adjust width of last col to absorb any div error
            if col == cols-1:
                colwidth = width - ((cols-1) * colwidth)
            tbl.tblGrid.add_gridCol(width=colwidth)

        for row in range(rows):
            # adjust height of last row to absorb any div error
            if row == rows-1:
                rowheight = height - ((rows-1) * rowheight)
            tr = tbl.add_tr(height=rowheight)
            for col in range(cols):
                tr.add_tc()

        return tbl