i want after i've been submit form it can show hit counter.. but i want after it reach "20" it can back to zero..bcoz the limit of submit is 20 times so it can't over the limit.

nasıl ben çalıştığını yapabilirim? Ben bu kodu denemek oldum ...

<?
$limit="20";
$Query_counter=mysql_query("SELECT model FROM inspec");
$Show_counter=mysql_fetch_array($Query_counter);
$show_counter = $show_counter["model"]+1;

if($show_counter > $limit[0]) {
      $show_counter = 0;
}elseif ($show_counter > $limit[1]) {
      $show_counter = 0;
}


$Query_update=mysql_query("UPDATE inspec SET model=$Show_counter");
$Show_counter=number_format($Show_counter);
$Show_counter=str_replace(",",".",$Show_counter);
echo "Hit:</br><strong>$show_counter</strong>";
?>