def captcha_show(request, name):
key = 'captcha_%s' % name
if not request.session.get(key, False):
c = Captcha()
request.session[key] = c.text
else:
c = Captcha(text=request.session.get(key))
fp_captcha = cStringIO.StringIO()
c.generate()
c.save(fp_captcha)
fp_captcha.seek(0)
res = HttpResponse(status=httplib.OK)
res['Content-Type'] = 'image/jpg'
res.write(fp_captcha.read())
return res
