if ($letter!="on")  
  {
     // Check for valid user
     $duplicate = @mysql_query("select count(*) no_of_records from newsletter where email1='$email1'");

     if (!$duplicate)
    {
        echo("Error performing query: " . mysql_error());
    }

     $row_duplicate = mysql_fetch_array($duplicate);

     if (($row_duplicate['no_of_records']) == "0")
     {
      // usuwanie rekordu
          $usun = "delete from newsletter where
                   email1='$email1'";
            //   mysql_query($sql);  
    
      if (@mysql_query($usun))
      {
        // echo("Thank you for registering");
        // echo($pageid);
        // echo($title);
        echo ("<meta http-equiv=refresh content=0;url=index.php>");
      }
      else
      {
          //echo ("This email address is already present in our database. Please check you entered the correct address. If you have, you may have already registered and do not need to register again.");
          echo ("<meta http-equiv=refresh content=0;url=index.php>");
          exit();
      }
     }
     //else
     //{
     //    echo ("Error registering user: " . mysql-error());
        //}

   }

if ($row_duplicate['no_of_records'] == "0")

if (($row_duplicate['no_of_records']) == "0")