help!!! replace 0 with word "unavailable"

I have got something like this
<?
include "inc/config.inc";
include "$INCLUDE_PATH/lib.inc";
include "$INCLUDE_PATH/cennik.inc";

?>

<?

$result=mysql_db_query($SQLDB,"SELECT price_list FROM price_lists");
for ($i=0; $i<count(mysql_num_rows($result)); $i++){
{
   if ($arr[$i] == 0) $arr[$i] = "brak";
}
}
 while($row=mysql_fetch_array($result)){
echo "</tr><tr bgcolor=$bgcolor><td bgcolor=\"#5B539D\">&nbsp;</td><td td
class=\"tabela\" align=center>".$arr[$row[price_list]]."</td></tr>\n";
}
?>

and I want to change all records with value "0" into  word "unavailable"
and it works but doesn't show  rest of records with diffrent value (only
unavailable)


Bart