Define a tolerance value for the pagebrowser. If the last page would have less or equal items than the tolerance value, the last page will be merged with the previous page. The user shouldn't have to use the pagebrowser to display 1 more item.

gistfile1.pl

# calculate totalPages
$pagebrowser{'totalPages'} = int($pagebrowser{'itemsCount'} / $pagebrowser{'itemsPerPage'}) + 1;
my $leap = ($pagebrowser{'itemsCount'} % $pagebrowser{'itemsPerPage'});
if ($pagebrowser{'totalPages'} > 1 && ($leap <= $pagebrowser{'tolerance'})) { # tolerance mode
	$pagebrowser{'totalPages'}--;
}

# validate currentPage & calculate offset
if ($pagebrowser{'currentPage'} > $pagebrowser{'totalPages'}) { # currentPage is higher than allowed
	$pagebrowser{'currentPage'} = $pagebrowser{'totalPages'};
}
$pagebrowser{'offset'} = $pagebrowser{'itemsPerPage'} * ($pagebrowser{'currentPage'} - 1);

# calculate itemsCountOnCurrentPage
$pagebrowser{'itemsCountOnCurrentPage'} = $pagebrowser{'itemsPerPage'};
if ($pagebrowser{'totalPages'} eq $pagebrowser{'currentPage'}) { # currentPage is last page
	if ($leap <= $pagebrowser{'tolerance'}) { # tolerance mode
		$pagebrowser{'itemsCountOnCurrentPage'} += $leap;
	} else {
		$pagebrowser{'itemsCountOnCurrentPage'} = $leap;
	}
}