Repeating column title every 20 rows

[nicdp]

How can I repeat automatically the column title every 20 rows/results?

[hand]

$cnt = 0;
while ($row = mysql_fetch_array($result)) {
    $cnt++;
	if ($cnt > 20) {
	   $cnt =1;
	}
	if ($cnt == 1) {
	   print "$title<br>\n";
	}
	print $row['whatever']."<br>\n";
}