if (window.document.images) {
	menu = new Image();
	menu.src = "img/menu.jpg";
	
	menu1a = new Image();
	menu1a.src = "img/" + lang + "/but_dojazd.jpg";
	menu2a = new Image();
	menu2a.src = "img/" + lang + "/but_kontakt.jpg";
	menu3a = new Image();
	menu3a.src = "img/" + lang + "/but_ofirmie.jpg";
	menu4a = new Image();
	menu4a.src = "img/" + lang + "/but_pytania.jpg";
	menu5a = new Image();
	menu5a.src = "img/" + lang + "/but_technologia.jpg";
	menu6a = new Image();
	menu6a.src = "img/" + lang + "/but_zapytanie.jpg";
	
	menu1b = new Image();
	menu1b.src = "img/" + lang + "/but_dojazd_h.jpg";
	menu2b = new Image();
	menu2b.src = "img/" + lang + "/but_kontakt_h.jpg";
	menu3b = new Image();
	menu3b.src = "img/" + lang + "/but_ofirmie_h.jpg";
	menu4b = new Image();
	menu4b.src = "img/" + lang + "/but_pytania_h.jpg";
	menu5b = new Image();
	menu5b.src = "img/" + lang + "/but_technologia_h.jpg";
	menu6b = new Image();
	menu6b.src = "img/" + lang + "/but_zapytanie_h.jpg";
	
	menub1a = new Image();
	menub1a.src = "img/menu1.jpg";
	menub2a = new Image();
	menub2a.src = "img/menu2.jpg";
	menub3a = new Image();
	menub3a.src = "img/menu3.jpg";
	menub4a = new Image();
	menub4a.src = "img/menu4.jpg";
	menub5a = new Image();
	menub5a.src = "img/menu5.jpg";
	menub6a = new Image();
	menub6a.src = "img/menu6.jpg";
	
	menub1b = new Image();
	menub1b.src = "img/menu1_h.jpg";
	menub2b = new Image();
	menub2b.src = "img/menu2_h.jpg";
	menub3b = new Image();
	menub3b.src = "img/menu3_h.jpg";
	menub4b = new Image();
	menub4b.src = "img/menu4_h.jpg";
	menub5b = new Image();
	menub5b.src = "img/menu5_h.jpg";
	menub6b = new Image();
	menub6b.src = "img/menu6_h.jpg";
}

var popup_w = 600;
var popup_h = 450;
var popup_h2 = 680;
var popup_rzuty_w = 800;
var popup_rzuty_h = 600;

function Change(id, nazwa)
{
  document.getElementById(id).src = nazwa;
}

function WpopUp(URL, w, h) {
  var p_left = ((screen.width / 2) - (w / 2));
  var p_top = ((screen.height / 2) - (h / 2))
  window.open(URL, "Zdjęcie", 'toolbar=0,scrollbars=0,location=0,statusbar=0,menubar=0,resizable=1,width=' + w + ',height=' + h + ',left = ' + p_left + ',top =  ' + p_top);
}

function Pasek()
{
  document.getElementById('pasek').style.height = document.getElementById('tresc').offsetHeight;
}

function KolorujMenu(id, ids, plik) {
  if (id != ids)
  {
	  document.getElementById('menu' + id).src = plik;
	}
}

function ChangeIMG(id, n) {
	document.getElementById(id).src = n;
}

function PageSHOW(id) {
	if (id == 7) {
		document.getElementById('menu' + id).src = "img/menu1_h.jpg";
		document.getElementById('menu' + id).onmousemove = null;
		document.getElementById('menu' + id).onmouseout = null;
	}
	if (id == 8) {
		document.getElementById('menu' + id).src = "img/menu2_h.jpg";
		document.getElementById('menu' + id).onmousemove = null;
		document.getElementById('menu' + id).onmouseout = null;
	}
	if (id == 9) {
		document.getElementById('menu' + id).src = "img/menu3_h.jpg";
		document.getElementById('menu' + id).onmousemove = null;
		document.getElementById('menu' + id).onmouseout = null;
	}
	if (id == 10) {
		document.getElementById('menu' + id).src = "img/menu4_h.jpg";
		document.getElementById('menu' + id).onmousemove = null;
		document.getElementById('menu' + id).onmouseout = null;
	}
	if (id == 11) {
		document.getElementById('menu' + id).src = "img/menu5_h.jpg";
		document.getElementById('menu' + id).onmousemove = null;
		document.getElementById('menu' + id).onmouseout = null;
	}
	if (id == 12) {
		document.getElementById('menu' + id).src = "img/menu6_h.jpg";
		document.getElementById('menu' + id).onmousemove = null;
		document.getElementById('menu' + id).onmouseout = null;
	}
}

function SprawdzEmail()
{
	if (document.getElementById('form_mail').value.search(/^[a-z0-9_.-]+([_\\.-][a-z0-9]+)*@([a-z0-9_\.-]+([\.][a-z]{2,4}))+$/i))
	{
		return false;
	}
	else
	{
		return true;
	}
}

function checkForm() {
	var blad = false;
	
	if (document.getElementById('form_imie').value == '')
	{
		document.getElementById('form_imie').className = "inputboxzle";
		blad = true;
	}
	else
	{
		document.getElementById('form_imie').className = "inputbox";
	}
	
	if (document.getElementById('form_nazwisko').value == '')
	{
		document.getElementById('form_nazwisko').className = "inputboxzle";
		blad = true;
	}
	else
	{
		document.getElementById('form_nazwisko').className = "inputbox";
	}
	
	if (document.getElementById('form_telefon').value == '')
	{
		document.getElementById('form_telefon').className = "inputboxzle";
		blad = true;
	}
	else
	{
		document.getElementById('form_telefon').className = "inputbox";
	}
	
	if (document.getElementById('form_tresc').value == '')
	{
		document.getElementById('form_tresc').className = "inputareazle";
		blad = true;
	}
	else
	{
		document.getElementById('form_tresc').className = "inputarea";
	}
	
	if (blad == true)
	{
    if (lang == 'pl') {
		  alert ("Wypełnij poprawnie wszystkie wymagane pola!");
		}
		if (lang == 'en') {
		  alert ("Fill-in correctly required fields!");
		}
		if (lang == 'de') {
		  alert ("Füllen Sie die erforderlichen Felder richtig aus!");
		}
		return false;
	}
	else
	{
	  if (document.getElementById('form_mail').value == '')
	  {
      document.getElementById('form_mail').className = "inputbox";
		  return true;
		}
		else
	  {
      if (SprawdzEmail() == false)
      {
        document.getElementById('form_mail').className = "inputboxzle";
        if (lang == 'pl') {
    		  alert ("Wpisz poprawny adres email!");
    		}
    		if (lang == 'en') {
    		  alert ('Please, fill-in "e-mail" field correctly');
    		}
    		if (lang == 'de') {
    		  alert ('Füllen Sie das Feld "E-mail" korrekt aus');
    		}
		    return false;
      }
      else 
      {
        document.getElementById('form_mail').className = "inputbox";
        return true;
      }
    }
	}
}