function navi(menu) {
    if (menu == "1") {
        var subnavi = '<div id="subbtn"><a href="game.php?menu=1">Newscenter</a></div><div id="subbtn"><a href="profil.php?menu=1&userid='+userid+'">My Profile</a></div><div id="subbtn"><a href="calendar.php?menu=1">Calendar</a></div><div id="subbtn"><a href="tournaments.php?menu=1">My tournament scheudule</a></div><div id="subbtn"><a href="training.php?menu=1">Training</a></div><div id="subbtn"><a href="personal.php?menu=1">Staff</a></div><div id="subbtn"><a href="equipment.php?menu=1">Equipment</a></div><div id="subbtn"><a href="tactics.php?menu=1">Tactics</a></div>';
        document.getElementById('subnavi').innerHTML = subnavi;
    }
    else if (menu == "2") {
        var subnavi = '<div id="subbtn"><a href="konto.php?menu=2">Account Overview</a></div><div id="subbtn"><a href="platos.php?menu=2">Platos</a></div><div id="subbtn"><a href="sponsor.php?menu=2">Sponsor</a></div>';
        document.getElementById('subnavi').innerHTML = subnavi;
    }
    else if (menu == "3") {
        var subnavi = '<div id="subbtn"><a href="ranking.php?menu=3">Single Ranking</a></div><div id="subbtn"><a href="nationenranking.php?menu=3">Nations Ranking</a></div><div id="subbtn"><a href="turniersiege.php?menu=3">Tournaments won</a></div><div id="subbtn"><a href="preisgeld.php?menu=3">Prize money</a></div>';
        document.getElementById('subnavi').innerHTML = subnavi;
    }
    else if (menu == "4") {
        var subnavi = '<div id="subbtn"><a href="mailbox.php?menu=4">Mailbox</a></div><div id="subbtn"><a href="password_change.php?menu=4">Change password</a></div><div id="subbtn"><a href="friends.php?menu=4">Invite your friends</a></div><div id="subbtn"><a href="guide.php?menu=4">Guide</a></div><div id="subbtn"><a href="firststeps.php?menu=4">Video Introduction</a></div><div id="subbtn"><a href="http://www.onlinetennismanager.org/forum/" target="_blank">Community</a></div><div id="subbtn"><a href="logout.php">Logout</a></div>';
        document.getElementById('subnavi').innerHTML = subnavi;
    }
}