Curl expert to advice on simple problem

I'm trying to scrape data from scroogle using PHP curl library. I do not get results, but I get message: "Sorry, but we are unable to provide results from Google" Need your advice on how to correct my curl requests to imitate the same form as on [login to view URL] See PHP code details below.... ## Deliverables Here is my PHP code: function doPostRequest($url, $postData, $http_header = null) { $session = curl_init($url); $options = array( CURLOPT_POST => true, CURLOPT_POSTFIELDS => $postData, CURLOPT_HEADER => false, CURLOPT_RETURNTRANSFER => true ); curl_setopt_array($session, $options); if (!is_null($http_header)) curl_setopt($session, CURLOPT_HTTPHEADER, $http_header); $response = curl_exec($session); curl_close($session); return $response; } class ScroogleParser { var $url = '[login to view URL]'; // Parses Scroogle search results; // $num - number of results to get, up to 100 function parse($keywords, $num) { if ($num > 0 && $num <= 20) $n = 2; elseif($num <= 50) $n = 5; elseif ($num <= 100) $n = 1; else throw new Exception('Incorrect value for number of required results'); $postData = array ('n' => $n, 'Gw' => $keywords); $postData = http_build_query($postData); $html = doPostRequest($this->url, $postData); // This instruction is for testing only. I want to get results page here, but I get "sorry..." message. echo $html; } }