#extracted captcha picture before, and catched user's reply in $captcha  
#trying to submit captcha code:
$param="numIg=&numDgc=&numIgc=&numIp=&pageSize=3&strWhere='.$mySearch.'&numDg=&numIpc=&numUgc=&numUgd=&strLicenseCode=&numIgd=&showType=1&numSortMethod=&strSources=&numUg=&pageNow=1&vct='.$captcha.'&Submit=%E7%BB%A7%E7%BB%AD";

$Search_url ="one website";
$request = HTTP::Request->new('POST', $Search_url);
$request->header('Accept' => 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8'); 
#$request->header('Accept-Language' => 'de,en-US;q=0.7,en;q=0.3');
$request->header( 'Referer' => "one webiste");


$request->header('Connection' => 'keep-alive'); 
$request->content($param);
$response = $ua->request($request);
$page = $response->decoded_content();
print $page;