'Start a table row'

def s_table_table_row(self, tag, attrs):

    c = attrs.get((TABLENS, 'style-name'), None)
    htmlattrs = {}
    if c:
        htmlattrs['class'] = ('TR-%s' % c.replace('.', '_'))
    self.opentag('tr', htmlattrs)
    self.purgedata()
