Django Captcha Ajax call not working

I have the following class view taken from documentation:

class CaptchaView(CreateView):
    template_name = "captcha.html"
    form_class = MyForm
   
    def form_invalid(self, form):
        if self.request.is_ajax():
            to_json_response = dict()
            to_json_response['status'] = 0
            to_json_response['form_errors'] = form.errors

            to_json_response['new_cptch_key'] = CaptchaStore.generate_key()
            to_json_response['new_cptch_image'] = captcha_image_url(to_json_response['new_cptch_key'])

            return HttpResponse(json.dumps(to_json_response), content_type='application/json')
        else:
            return HttpResponse("test1", content_type='application/json')

    def form_valid(self, form):
        if self.request.is_ajax():
            to_json_response = dict()
            to_json_response['status'] = 1

            to_json_response['new_cptch_key'] = CaptchaStore.generate_key()
            to_json_response['new_cptch_image'] = captcha_image_url(to_json_response['new_cptch_key'])

            return HttpResponse(json.dumps(to_json_response), content_type='application/json')
        else:
            return HttpResponse("test2", content_type='application/json')


and the following ajax call from template:

    <script type="text/javascript">
        function captcha() {
            $.ajax({
                type: "POST", 
                url: "../captcha",
                contentType: "application/json",
                data: {},
                dataType: "json",
                success: function(data) {
                    alert("success");
                  },
                error: function(data) {
                    alert("not OK");
                  }

                });
        }
    </script>


<input type="button" id="button" onclick="captcha()" value="OK"/>

url(r'^captcha$', views.CaptchaView.as_view(), name="captcha")

Could you please help me to get a proper ajax call? When i click the OK button no success or error message is displayed!!!

Please help me out!!

thanx

valerio

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