how works IWebBrowser2.Navigate?

[ThinkingPrometheus]

hiho@ll

i try to auto login a website using the postdata i got from a form

my code:

CString url("

http://www.mytestlogin.de/public/login.php");

CString post("user=testuser&pwd=testpass&log=&login=Login");
CString header("Content-Type application/x-

http://www-form-urlencoded");

COleVariant vPostData(post);
COleVariant vHeader(header);

BSTR str=::SysAllocString(T2OLE(url.GetBuffer()));

m_pWebBrowser->Navigate(str,COleVariant((long)0,VT_I4),
COleVariant("_SELF", VT_BSTR),vPostData,vHeader);

does anybody know why it doesn't work?
all i get is the login page, where i have to put username and pass and click the login button

but with the code above i should be in the member area!?

i traced the http connection with a http proxy and the browser doesn't send the post data and my header!?

Is there a failure in variable declaration?
whats wrong?

thx@ll