PHP & cURL

Hallo,

i have this code:
set_time_limit(0);

$cURL = curl_init();

curl_setopt($cURL, CURLOPT_URL, "https://acc.acme.lt/indexas.php?username=xxxxx&password=xxxxx");
curl_setopt($cURL, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt($cURL, CURLOPT_HEADER, 1);
curl_setopt($cURL, CURLOPT_FAILONERROR, 1);
curl_setopt($cURL, CURLOPT_REFERER, "https://acc.acme.lt/indexas.php");
curl_setopt($cURL, CURLOPT_RETURNTRANSFER, 1);

$strContent = curl_exec($cURL);
echo $strContent;

curl_close($cURL);
---------------------
it returns the login box with note that the password or login was wrong?! if i try with CURL_POST...&POSTVARS it returns just login box without any errors. The browser sets cookie whit sid, i can see this in the output of CURL_HEADER, if i do copy & paste into browser, its OK , i get loged in.... but why this pease of code does not return me HTML code, which im getting when im loged in?!!

Thanx (-: