$(document).ready(function() {
  $('#btnlogin').click(function(){
    
    var temp = '';
    temp = '<form action="login/" method="post"><span>Login:</span> <input type="text" name="username" value="" /> <span>Heslo:</span> <input type="password" name="password" value="" /> <input type="submit" name="" value="Přihlásit" class="submit" /></form>';
      
    $('p#plogin').fadeOut();
      setTimeout(function() {
      $('p#plogin').html(temp);  
    }, 900);
    
    setTimeout(function() {
      $('p#plogin').fadeIn();
    }, 1000);  
    
  });
});