Zapis do Mysql...Nic se nestane

<?php
$mysqlServer = 'localhost';
$mysqlLogin = 'upimage.707.cz';
$mysqlHeslo = '*********';
$mysqlDatabaze = 'upimage_707_cz';
$link = mysql_connect($mysqlServer, $mysqlLogin, $mysqlHeslo);
  if ( $link )
  {
    mysql_select_db( $mysqlDatabaze );
    //echo 'Pripojeno';
  } 
  else 
  {
    Header("Location: ./error/mysql.html");
  }
php?>

<? include "include/connect.php" ?>
    <?
      switch ($_GET[pg]) 
      {
        default:
        echo"<a href='?pg=registration'> aaa </a>";
        break;
      
        case 'registration':
        
        if($login=="" or $pass=="" or $email=="")
        {
          echo
          "
          <form method='post'>
          Login : <input type='text' name='login'><br>
          Password : <input type='password' name='pass'><br>
          Email : <input type='text' name='email'><br>
          <input type='submit' value='Registruj se'>
          </form>
          ";
        }
        else
        {
          $user_vyber = MySQL_Query("SELECT * FROM user");
          //-------------------------------------------------------
          while ($user_db = MySQL_Fetch_Array($user_vyber))
          {
            if($login == $user_db[login])
            {
              $exist = "1";
            }
          }
          
          if($exist == "1")
          {
            echo "Tento účet už existuje zvolte prosím jíný";
          }
          else
          {
            echo "Pridano";
            $sha_pass = sha1($pass); 
            $ip = $_SERVER['REMOTE_ADDR'];
            MySQL_Query("INSERT INTO user VALUES('','$login','$sha_pass','$email','$ip')");
          }
        }
        break;
      }
    ?>

$neco = $_POST['neco']