<?php


  if ($_GET['wybor'] == 'logout')
      {
        header("Location:logout.php");
        exit();
      }
   else
      {

     if (empty($_POST['login']))   {
                                   header("Location: index.php?id=blad_logowania");
                                   }

       elseif (empty($_POST['haslo']))     {
                                          header("Location: index.php?id=blad_logowania");
                                          }

   else {


     $user = $_POST['login'];
     $pass = $_POST['haslo'];

     $polaczenie=mysql_connect("localhost","root","krasnal");
     mysql_select_db("users",$polaczenie);


     $check=mysql_query("SELECT * FROM table_users WHERE login='$user' AND pass='$pass'");

     $liczba=mysql_num_rows($check);

      if ($liczba==1)   {
               session_start();
               $_SESSION['userID'] = $user;
               header("Location: index.php");
               }
            else
            {
              header("Location: index.php?id=blad_logowania");
             }
       }
           }
?>