function hide_layers()
	{
	document.getElementById("div_oferta1").style.display = "none";
	document.getElementById("div_oferta2").style.display = "none";
	document.getElementById("div_oferta3").style.display = "none";
	document.getElementById("div_oferta_strony").style.display = "none";
	
	document.getElementById("div_kontakt").style.display = "none";
	
	document.getElementById("div_galeria1").style.display = "none";
	document.getElementById("div_galeria2").style.display = "none";
	document.getElementById("div_galeria3").style.display = "none";
	document.getElementById("div_galeria4").style.display = "none";
	document.getElementById("div_galeria_strony").style.display = "none";
	}

function show_layer(nazwa_warstwy)
	{
	if(nazwa_warstwy=='div_kontakt')
		{
		hide_layers();
			
		document.getElementById("metka").src = "images/icon_kontakt.jpg";
		document.getElementById("obrazek").src = "images/icon_kontakt_image.jpg";
		
		document.getElementById("div_kontakt").style.display = "block";
		}
		
	if(nazwa_warstwy=="div_oferta1" || nazwa_warstwy=="div_oferta2" || nazwa_warstwy=="div_oferta3")
		{
		hide_layers();
		
		document.getElementById("metka").src = "images/icon_oferta.jpg";
		document.getElementById("obrazek").src = "images/icon_oferta_image.jpg";
			
		document.getElementById(nazwa_warstwy).style.display = "block";
		document.getElementById("div_oferta_strony").style.display = "block";
		}
		
	if(nazwa_warstwy=="div_galeria1" || nazwa_warstwy=="div_galeria2" || nazwa_warstwy=="div_galeria3" || nazwa_warstwy=="div_galeria4")
		{
		hide_layers();
		
		document.getElementById("metka").src = "images/icon_galeria.jpg";
		document.getElementById("obrazek").src = "images/icon_galeria_image.jpg";
			
		document.getElementById(nazwa_warstwy).style.display = "block";
		document.getElementById("div_galeria_strony").style.display = "block";
		}
	
	document.getElementById(nazwa_warstwy).style.display = "block";
	}