function visi_menu(nr,status) {

	if (document.layers)
	{
		
		document.over_ycia.style.visibility = 'hide';
		document.activiteiten.style.visibility = 'hide';
		document.missies.style.visibility = 'hide';
		document.projecten.style.visibility = 'hide';
		document.aanmelden.style.visibility = 'hide';
		
		vista = (status == 'hide') ? 'hide'		: 'show'
		document.layers[nr].visibility = vista;
	}
	else if (document.all)
	{
		
		document.all.over_ycia.style.visibility = 'hidden';
		document.all.activiteiten.style.visibility = 'hidden';
		document.all.missies.style.visibility = 'hidden';
		document.all.projecten.style.visibility = 'hidden';
		document.all.aanmelden.style.visibility = 'hidden';
		
		vista = (status == 'hide') ? 'hidden'	: 'visible';
		document.all[nr].style.visibility = vista;
	}

	else if (document.getElementById)
	{
		
		document.getElementById('over_ycia').style.visibility = 'hidden';
		document.getElementById('activiteiten').style.visibility = 'hidden';
		document.getElementById('missies').style.visibility = 'hidden';
		document.getElementById('projecten').style.visibility = 'hidden';
		document.getElementById('aanmelden').style.visibility = 'hidden';
		
		vista = (status == 'hide') ? 'hidden'	: 'visible';
		document.getElementById(nr).style.visibility = vista;

	}

}