my $ua = LWP::UserAgent->new(
         verify_hostname => 0);
#downloading the form:
$ua->cookie_jar($cookie_jar); 
$ua->agent('Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; InfoPath.1; .NET CLR 2.0.50727)');

my $url = www.anywebsite.com
my $response = $ua->get($url);
 die "Couldn't get $url", $response->status_line unless $response->is_success;

#submitting the form:
$keyword = "asdsa";
$Search_url ="www.wheretosubmit.com";
$param = 'showType=1&strSources=&strWhere='.$strWhere.'&numSortMethod=&strLicenseCode=&numIp=&numIpc=&numIg=&numIgc=&numIgd=&numUg=&numUgc=&numUgd=&numDg=&numDgc=&pageSize=3&pageNow=1';
$request = HTTP::Request->new('POST', $Search_url);
$request->header('Content-Type' => 'application/x-www-form-urlencoded');
$request->header('Referer' => "www.webpage.com");
$request->header('Accept' => 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8'); 
$request->header('Connection' => 'keep-alive'); 
$request->content($param);
$response = $ua->request($request);
$page = $response->decoded_content();


#parsing $page to catch the captcha image and get the user recognition
...

#trying to send captcha text away:
while(defined($captcha)){

$param="numIg=&numDgc=&numIgc=&numIp=&pageSize=20&strWhere='.$strWhere.'&numDg=&numIpc=&numUgc=&numUgd=&strLicenseCode=&numIgd=&showType=1&numSortMethod=&strSources=&numUg=&pageNow=1&vct='.$captcha.'&Submit=%E7%BB%A7%E7%BB%AD";


$Search_url ="www.webpage.com";
$request = HTTP::Request->new('POST', $Search_url);
$request->header('Host' => 'www.webpage.com' ); 
$request->header('Accept' => 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8'); 

$request->header( 'Referer' => "www.webpage.action");
$request->header('Connection' => 'keep-alive'); 
$request->content($param);
$response = $ua->request($request);
$page = $response->decoded_content();

##instead of accepting the captcha submit and leading on the result page, the webpage reload ( and just to another captcha)