Sowas wie session_start() brauchst du natürlich nicht? 
							
						
					
							
						
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        <?php    
        # eine Switch Case anfrage für die jeweilig "includete" Datei.
        switch ($_GET["menu"]){
case "00":
    include("./login.php");
break;
case "01":
    include("./newUser/newUser.php");
break;
case "02":
    include("./about_the_game.html");
break;
case "03":
    include("./about_us.html");
break;
case "04":
    include("./spenden.htm");
break;
case "05":
    include("./agb.html");
break;
case "06":
    include("./impressum.php");
break;
case "07":
    include("./bausystem.php");
break;
#case "08":
#    include("____.php");
#break;
case "09":
    include("./top100.php");
break;
case "10":
    include("./changeUser/changeUser.php");
break;
default:
include("login.php");
}
if (empty($_SESSION['loginname'])) {
        $path="Bilder/not_in/";
        $_7  = "./index.php?";
        $_8  = "./index.php?menu=00";
        $_9  = "./index.php?menu=01";
        $_10 = "./index.php?menu=02";
        $_11 = "./index.php?menu=03";
        $_12 = "./index.php?menu=04";
        $_13 = "./index.php?menu=05";
        $_14 = "./index.php?menu=06";
                
    } elseif (!empty($_SESSION['loginname'])) {
        $path="Bilder/in/";
        $_7  = "./index.php?";
        $_8  = "./index.php?menu=07";
        $_9  = "./index.php?menu=08";
        $_10 = "./index.php?menu=09";
        $_11 = "./index.php?menu=10";
        $_12 = "./index.php?menu=11";
        $_13 = "./index.php?menu=12";
        $_14 = "./index.php?menu=13";
}
?>
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