use CGI;

my $cgi = CGI->new(); # neues CGI-Objekt erzeugen
my %params = $cgi->Vars();
print $cgi->header(-type => 'text/html');

my @values = split(/\0/,$params{kategorie});

print $cgi->start_html(),$cgi->h2('Werte aus select');
print $_,'<br />' for(@values);
print $cgi->end_html();