function show_tab(id) {
		document.getElementById('t_Poradnik').style.display="none";
		document.getElementById('t_Ogrody').style.display="none";
		document.getElementById('t_Fotogaleria').style.display="none";
		document.getElementById('t_Poradnik_a').className="";
		document.getElementById('t_Ogrody_a').className="";
		document.getElementById('t_Fotogaleria_a').className="";
		document.getElementById(id).style.display="block";
		document.getElementById(id+'_a').className = "active";
	}