Son sekliyle asagidaki gibi yaptim; ancak hata devam ediyor;
dinle.php
<iframe name="oyver" src="oylar.php?muzik_id=<?php echo $muzik_id;?>"  width="280" height="35" scrolling="no" frameborder="0" marginwidth="0" marginheight="0"></iframe>
oylar.php
 <form action="oyver.php?muzik_id=<? echo $_GET['muzik_id'];?>" method="GET" target="oyver">
<center><input type="radio" name="oy" value="5" checked="checked" /> 5 
<input type="radio" name="oy" value="6" /> 6 
<input type="radio" name="oy" value="7" /> 7 
<input type="radio" name="oy" value="8" /> 8 
<input type="radio" name="oy" value="9" /> 9 
<input type="radio" name="oy" value="10" /> 10 
<input type="submit" name="oyla" value="OYLA"  /> 
</center>
</form>
oyver.php
<?

include("ayar.php");

 function real_ip_adress() { 
        global $HTTP_SERVER_VARS;  
        $gizli_ipler = array( '10.0.0.', '192.168.', '127.0.0.', '172.16.0.' );  
        if( isset($_SERVER['HTTP_X_FORWARDED_FOR']) && $_SERVER['HTTP_X_FORWARDED_FOR'] != '' ) {  
            $ip_strings = explode( ',',$_SERVER['HTTP_X_FORWARDED_FOR']);  
                foreach($ip_strings as $k => $v) { 
                    if( empty($v) ) { 
                        unset( $ip_strings[$k] );  
                    } else { 
                        if(!isset($ip_string)) {  
                            $ip_string = $v;  
                        }  
                    }  
                }  
        }  
        if( isset($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] != '' ) {  
            $ip_strings[] = $_SERVER['REMOTE_ADDR'];  
                if(!isset($ip_string)) { 
                    $ip_string = $_SERVER['REMOTE_ADDR']; 
                }  
        }  
        foreach($ip_strings as $k1 => $ip) { 
            foreach($gizli_ipler as $k2 => $pip) {  
                if(strpos($ip, $pip) === 0) {  
                    unset($ip_strings[$k1]); break;  
                }  
            }  
        }  
        if(!empty($ip_strings) ) {  
            foreach( $ip_strings as $v ) { 
                if(!empty($v)) {  
                    $ip_string = $v;  
                    $is_local_ip = false;  
                    break;  
                } 
            } 
        } else {  
            $is_local_ip = true; 
        }  
        return $ip_string;  
    } 
    $ip    = real_ip_adress();
$a=$_GET['muzik_id'];
$oy=$_GET['oy'];
$s=mysql_query("SELECT * FROM oylama where ip='$ip' and muzik_id='$a'");
$kactane=mysql_num_rows($s);
if($kactane>0){
print ("<script language='javascript'>alert('Daha Önce Oy Kullandiniz');history.go(-1);</script>");
	exit;	};
}else{

$sorgu=mysql_query("INSERT INTO oylama (oy, muzik_id, ip) values ('$oy', '$a', '$ip')");
print ("<script language='javascript'>alert('Oy Kullandiginiz İcin Tesekkürler');history.go(-1);</script>");
	exit;	}
	 ?>