Retreive DOM data from site
onclick="(JSCC.get('j4eb9ad57ab8a19f468880561') && JSCC.get('j4eb9ad57ab8a19f468880561').getHandler())(); return false;"

private CookieContainer GetCookieContainer(string loginURL, string userName, string password)
{
    var webRequest = WebRequest.Create(loginURL) as HttpWebRequest;
    var responseReader = new StreamReader(webRequest.GetResponse().GetResponseStream());
    string responseData = responseReader.ReadToEnd();
    responseReader.Close();

    // Now you may need to extract some values from the login form and build the POST data with your username and password.
    // I don't know what exactly you need to POST but again a TamperData observation will help you to find out.
    string postData =String.Format("UserName={0}&Password={1}", userName, password); // I emphasize that this is just an example.

    // cookie container
    var cookies = new CookieContainer();

    // post the login form
    webRequest = WebRequest.Create(loginURL) as HttpWebRequest;
    webRequest.Method = "POST";
    webRequest.ContentType = "application/x-www-form-urlencoded";
    webRequest.CookieContainer = cookies;

    // write the form values into the request message
    var requestWriter = new StreamWriter(webRequest.GetRequestStream());
    requestWriter.Write(postData);
    requestWriter.Close();

    webRequest.GetResponse().Close();
    return cookies;
}

var webRequest = WebRequest.Create(url) as HttpWebRequest;
webRequest.CookieContainer = GetCookieContainer(url, userName, password);
var responseStream = webRequest.GetResponse().GetResponseStream();