$harf=$_GET['harf'];
if($harf==NULL or strlen($harf)!=1){$harf='A';}
$sayilar=range(65,90);
foreach($sayilar as $x){
echo '<a href="hile.php?harf='.chr($x).'">'.chr($x).'</a>';}

$sql=myql_query("select * from hileler where baslik like '$harf%'");