başlıklar arasına reklam koymak

<? $isimx = mysql_query("SELECT * FROM deneme ORDER BY id DESC LIMIT 0,20");
while($link = mysql_fetch_array($isimx))
{
$heyyy2 .= "<a href=\"".$link['hid']."\" target=\"_blank\">".ucwords(strtolower($link['baslik']))."</a><br>";
} 

echo $heyyy2;
?>

<?php
include("ayar.php");
$i = 0;
$sor = mysql_query("SELECT * FROM isimler ORDER BY id ASC");
while($yaz=mysql_fetch_array($sor)){


if($i%3==0){
echo "<b>Reklam Alanı</b><br>";
}

	$isim = $yaz["isim"];
	echo $isim."<br>";
	$i++;
}
?>