POST+ASPX+COOKIE

Pozdrawiam,
"Przeznaczenie - wymówka głupca w chwili klęski",
Wywrotowiec

Hello,

Is here anyone who could help beginner with checking some www site with 
authorization. It looks like this:

I connect to http://foobar.com -> open this page and find HIDDEN field 
with something like hash -> convert value from Hidden field to URL 
encoding -> POST 
http://foobar.com/Login.aspx?ValueFromHidenField&user=myuser&password=mypassword 
-> after that I should receive two cookies: sessionID and userID, but 
nothing like this happenes. I recived only one cookie -> then I should 
be able to get rest of the pages(after succesfull auth.).

use strict;
use LWP::UserAgent;
use HTTP::Cookies;
use CGI;

my $cj = HTTP::Cookies->new(
    file => 'f:\cooki.txt',
    autosave => 1,
  );
my $ua = LWP::UserAgent->new(cookie_jar=>$cj);
my $odp = $ua->post('http://foobar.com');
my $tekst = $odp->content;
my $mzz = index($tekst,'__VIEWSTATE'); #VIEWSTATE is this hidden field
my $mzz = index($tekst,"\"",($mzz+length('__VIEWSTATE')+1));
my $mzzz = index($tekst,"\"",($mzz+1));
my $vs = substr ($tekst,($mzz+1),($mzzz-$mzz-1));
my $vs = CGI::escape($vs);
my $odp = 
$ua->post('http://foobar.com/Login.aspx?ValueFromHidenField&user=myuser&password=mypassword');
print $odp->content;

Print prints content of http://foobar.com. I've tried to print 
$cj->extract_cookies( $odp ), but I've recived only HASH with adress.