'Return footnote back-link id.'

def makeFootnoteRefId(self, id, found=False):

    if self.getConfig(u'UNIQUE_IDS'):
        return self.unique_ref((u'fnref%s%d-%s' % (self.get_separator(), self.unique_prefix, id)), found)
    else:
        return self.unique_ref((u'fnref%s%s' % (self.get_separator(), id)), found)
