if($_SERVER['HTTP_REFERER'] == $system["url"]."/RegistracePrihlaseni") {
    if($_POST["mail"] == $admin["login"] && $_POST["password"] == $admin["password"]) {
        session_start();
        $_SESSION["logged"] = true;
        $_SESSION["admin"] = true;
        Header("Location:".$system["url"]);
    } elseif(login($_POST["mail"], $_POST["password"])) {
            $_SESSION["logged"] = true;
            $_SESSION["admin"] = false;
            $_SESSION["mail"] = $_POST["mail"];
            Header("Location:".$system["url"]);
    } else {
        $template["obsah"] = "<script>window.location.href=\"{$system["url"]}/RegistracePrihlaseni\";</script>";
    }

} else {
    Header("Location:".$system["url"]."/RegistracePrihlaseni");
}