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use LWP::UserAgent;
use HTTP::Cookies;
...
  $res = $ua->get("http://www.giftman.ru/show.php?id=$ren");
  print $res->header('Location')."\n";
}

GET /show.php?id=294 HTTP/1.1
Host: www.giftman.ru
...
Accept-Encoding: gzip, deflate
Cookie: __utma=83753984.1287093182.1370328704.1371539232.1371576574.7;
+ __utmz=83753984.1370328704.1.1.utmcsr=(direct)|utmccn=(direct)|utmcm
+d=(none); __utmb=83753984.10.10.1371576574; _ym_visorc=w; PHPSESSID=4
+p0ql1mitskhkbg3os47v1hc11; __utmc=83753984
Connection: keep-alive