function menuonoff(polozka) {
	if (polozka==1) {
		document.getElementById("menu1").style.visibility = "visible";
		document.getElementById("menu2").style.visibility = "hidden";
		document.getElementById("menu3").style.visibility = "hidden";
		document.getElementById("menu4").style.visibility = "hidden";
	}
	if (polozka==2) {
		document.getElementById("menu1").style.visibility = "hidden";
		document.getElementById("menu2").style.visibility = "visible";
		document.getElementById("menu3").style.visibility = "hidden";
		document.getElementById("menu4").style.visibility = "hidden";
	}	
	if (polozka==3) {
		document.getElementById("menu1").style.visibility = "hidden";
		document.getElementById("menu2").style.visibility = "hidden";
		document.getElementById("menu3").style.visibility = "visible";
		document.getElementById("menu4").style.visibility = "hidden";
	}	
	
	if (polozka==4) {
		document.getElementById("menu1").style.visibility = "hidden";
		document.getElementById("menu2").style.visibility = "hidden";
		document.getElementById("menu3").style.visibility = "hidden";
		document.getElementById("menu4").style.visibility = "visible";
	}	
	if (polozka==5) {
		document.getElementById("menu1").style.visibility = "hidden";
		document.getElementById("menu2").style.visibility = "hidden";
		document.getElementById("menu3").style.visibility = "hidden";
		document.getElementById("menu4").style.visibility = "hidden";
	}	
}