function zmien(id, podmenu) {
	var obr1 = new Image(210, 183);
	obr1.src = "glowna.jpg";
	var obr2 = new Image(210, 183);
	obr2.src = "nauka.jpg";
	var obr3 = new Image(210, 183);
	obr3.src = "galeria.jpg";
	var obr4 = new Image(210, 183);
	obr4.src = "instruktorzy.jpg";
	var obr5 = new Image(210, 183);
	obr5.src = "kontakt.jpg";
	var obr6 = new Image(210, 183);
	obr6.src = "wypozyczalnia.jpg";
	var obr7 = new Image(210, 183);
	obr7.src = "cennik.jpg";
	document.getElementById('obrazek').src = id+".jpg";
	
	if(podmenu){
		var nowy = document.createElement("div");
		nowy.style.border = "1px solid black";
		nowy.style.position = "absolute"
		nowy.style.width = "150px"
		nowy.style.backgroundColor = "#DBDBDB"
		nowy.innerHTML = "CHUJ";
		nowy.onmouseout = usun;
		nowy.id = "podmenu";
		document.getElementById('nauka_podmenu').appendChild(nowy);
	}
}

function usun() {
	var x = document.getElementById("podmenu");
	document.getElementById('nauka_podmenu').removeChild(x);
}