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if(!$USER->IsAuthorized()){
 $cookie_login = $_COOKIE[COption::GetOptionString("main", "cookie_name", "BITRIX_SM")."_LOGIN"];
 $cookie_md5pass = $_COOKIE[COption::GetOptionString("main", "cookie_name", "BITRIX_SM")."_UIDH"];
 $USER->LoginByHash($cookie_login, $cookie_md5pass);
}