I am trying to do the following via python:

From this website:
<http://www.bmf.com.br/arquivos1/arquivos_ipn.asp?idioma=pt-BR&status=ativo>

I would like to check the 4th checkbox and then click on Download image.

That is what I did:

```
import urllib2
import urllib
url = "http://www.bmf.com.br/arquivos1/arquivos_ipn.asp?idioma=pt-BR&status=ativo"
payload = {"chkArquivoDownload3_ativo":"1"}
data = urllib.urlencode(payload)
request = urllib2.Request(url, data)

print request

response = urllib2.urlopen(request)
contents = response.read()

print contents

```

Does anyone have any suggestions?