<div id="main">
		<?php
                    $flag = 0;
                    if(isset($_POST['przycisk'])){
			$login = $_POST['login'];
			$haslo = $_POST['haslo'];
                        try {
                            $user = 'root';
                            $pass = 'trywialne';
                            $dbh = new PDO('mysql:host=localhost;dbname=uzytkownik',$user, $pass);

                            $result = $dbh->query('SELECT * from uzytkownik');
                            foreach ($result as $row)
                            {
                                if($row['login']==$login && $row['haslo']==$haslo)
                                {
                                    $flag = 1;
                                }
                            }
                        }
                        catch(PDOException $e) {
                            print "Error!: " . $e->getMessage() . "<br/>";
                            die();
                        }

			if (empty($login) || empty($haslo) || $flag == 0)
                        {
                            echo '<script language=\"JavaScript\"> window.alert(\"Blablablablablabla\");} </script>';
                        }
			if(!isset($_POST['przycisk']) || $flag == 0)
                        {
                            echo '<h2>Witaj!</h2>';
                        }
                    }
		?>
		</div>