Halli Hallo,
php-lösung:
switch(true){
case $Listenfeld_1 == 'Auto' && $Listenfeld_2 == 'Benzin' :
include('autobenzin.html');
break;
case $Listenfeld_1 == 'Auto' && $Listenfeld_2 == 'Diesel' :
include('autodiesel.html');
break;
case $Listenfeld_1 == 'Motorrad' && $Listenfeld_2 == 'Benzin' :
include('motorradbenzin.html');
break;
}