Ahah, well, thanks to you and Some Random Fox (thanks, E), I think I pretty much got it working :o) I got rid of the file-extensions part 'cause the pss and viewsourse.php scripts were stupid, so now it's all in showtext.php (which I'll fix later)

Aaaannd...here's the code ^.^:

#!/usr/bin/perl
# RedFox! Productions: DirList
# All coding done by one Ranna Fox

use rfp;
use strict;
use CGI qw( :standard );
my $r = new rfp;

my $file = param('d') || "prefix/";
$r->print_start("RF!P::DL->($file);");
if ($file =~ /^\//) {
  print "<b>Ahem...you may not list files with absolute paths.  Especi
+ally not <em>that</em> absolute path</b>\n";
  $r->print_end;
  exit;
} elsif ($file =~ /\.\./) {
  print "<b>'Scuse me, I won't list directories with .. in their path.
+  Better fix that.</b>\n";
  $r->print_end;
  exit;
} elsif (not $file =~ /^prefix\//) {
  print "<b>See, the way things work is that if you're gonna list a di
+rectory, you gotta put a 'prefix/' before it, which means it has to b
+e in my directory.<b>\n";
  $r->print_end;
  exit;
}

my $filen;
($filen = $file) =~ s{^prefix/}{/home/admin/ranna/public_html/};
if (not -d $filen) {
  print "<b>That...uh...doesn't appear to exist... o.O</b>\n";
  $r->print_end;
  exit;
}

&parse_dir($filen, $file);

sub parse_dir {
  my $dir = $_[0];
  my $req = $_[1];
  opendir(PARSEDIR, "$dir") || die "Couldn't open directory $dir: $!\n
+";
  my $currdir;
  $dir =~ s/(.*)\/$/$1/;
  ($currdir = $dir) =~ s{.*/([^/]*)$}{$1}; 
  print "<li><b>$currdir/</b>\n<ul>\n";
  foreach my $file (readdir(PARSEDIR)) {
    my $fullname = $dir . "/" . $file;
    next if ($file =~ /^\..*/ || ! -r $fullname);
    if (-d $fullname) {
      $req = $req . "/" . $file;
      &parse_dir($fullname, $req);
    } else {
      my $dirn;
      ($dirn = $dir) =~ s{/home/admin/ranna/public_html}{};
      print "<li>[<a href=$dirn/$file>Bare link</a>]";
      if (-T $fullname) {
        print "[<a href=/showtext.php?file=prefix$dirn/$file>Online</a
+>]";
      } else {
        print "[<a href=$dirn/$file>Download</a>]";
      }
      print " - $file</li>\n";
    }
  }
  closedir(PARSEDIR);
print "</ul>\n";
}
$r->print_end;
[download]

And, not to forget, an example.