function skryt() {
	var arguments = skryt.arguments;
	for (var i = 0; i < arguments.length; i++) {
		document.getElementById(arguments[i]).style.display='none';
	}
}

function zobrazit() {
	var arguments = zobrazit.arguments;
	for (var i = 0; i < arguments.length; i++) {
		document.getElementById(arguments[i]).style.display='block';
	}
}

function oznacit_pozadi(id) {
	var myLink = document.getElementById(id);
	myLink =  myLink.firstChild;
	if(id == 'menu_sluzby') {
		myLink.style.color = '#FFF9C9';
	} else if(id == 'menu_reference') {
		myLink.style.color = '#CAE2E6';
	} else {
		myLink.style.color = '#fff';
	}
	document.getElementById(id).style.background = "url('/img/menu.png') no-repeat bottom left";
}

function odznacit_pozadi(id) {
	var myLink = document.getElementById(id);
	myLink =  myLink.firstChild;
	myLink.style.color = '#d5d5d5';
	document.getElementById(id).style.background = "url('/img/menu.png') no-repeat top left";
}