<form method="POST" action="" />
<input type="submit" name="submit" value="Нулирай" /><br />
</form>
<?php
if(isset($_POST['submit']))
{
mysql_query(UPDATE `таблицата` SET drivercar = '0',fighter = '0',killer = '0',busy = '0' WHERE `name` = '$name');
echo 'Успешно нулира нещата!';
}
?>