See my comments at my other reply to you.

Replace the latter half of your "galleryprint.pl" script with something like this:

my $page = url_param('page');
$page ||= 1;

my $first = ($page - 1) * 20;
my $last  = $first + 19;

print "<table>\n";

my $counter = 0;
for ( (grep defined, reverse keys %upload)[ $first .. $last ] ) {

    my ( $filename, $width, $height ) = split ( /::/, $upload{$_} );
    print " <tr>" unless ( $counter % 5 );

    print qq(<td width=120" height="120">),
          qq(<a href="$imagedir/$filename" target="new">),
          qq(<img src="$imagedir/$filename" height="100" width="100">)
+,
          qq(</a></td>);
    unless ( ++$counter % 5 ) {
        print "</tr>\n";
    }
}
print "</table>";
[download]

I renamed the variables $first and $last to avoid the ambiguity of $bottom and $top I.e. It wasn't easy to tell whether you meant "bottom of page" or "bottom of range" (The bottom of the page would be the top of the range.) Whereas, $first is unambiguous because it is both the first image on the page and the first index in the range. Likewise with $last.

-sauoq
"My two cents aren't worth a dime.";