'Scroll the text to the next page. Quit if already at the end
of the page.'

def page_next(self):

    if (self._pos >= (self._npages - 1)):
        self.page_quit()
    else:
        self._pos += 1
        self.display()
        if (self.exit_on_lastpage and (self._pos == self._pos >= (self._npages - 1))):
            self.page_quit()
