def show_captcha_dialog(self, captcha_id):
if self.captcha_dialog is None:
self.captcha_dialog = CaptchaDialog(self)
captcha_url = "http://www.douban.com/misc/captcha?id=%s&size=s" % captcha_id
self.captcha_dialog.set_captcha(captcha_id, captcha_url)
self.captcha_dialog.show()
