check ค่าตามโค๊ดด้านล่างแล้ว ไม่เห็นมีอะไรออกมาเลยครับท่าน

<td class=\"td-10\" style=\" font-size: 12px; \" >
    <a id=$datas[id]'>
        $sql = "SELECT * FROM  message_contact WHERE products_id = '$products_id' AND sender_id = '$sender_id' 
                    AND recipients_id = '$recipients_id' AND un_read == 'yes'  ";
        $query = mysql_query($sql);
        $check  = mysql_fetch_array($query);
            if($check)
               {
                   $mail_img = unread;
               }
            else
               {
                   $mail_img = read; 
               }
      $mail_img
    </a>
</td>
<td class=\"td-2\"  style=\" font-size: 12px; \" >
    <a id=$datas[id]'>
        $offer_name
    </a>
</td>