document.write('');
function setDisplay(ind)
{
	var cont1 = document.getElementById('area_' + ind);
	for (var i=1; i<=4; i = i+1)
	{
		var cont2 = document.getElementById('area_' + i);
		if (ind != i)
		{
			if (cont2)
				cont2.style.display = 'none';
		}
		else
		{
			if (cont1)
				cont1.style.display = 'block';	
		}
	}
}

function prova()
{
	for (var i=1; i<=4; i = i+1)
	{
		var cont1 = document.getElementById('area_' + i);
		if (cont1)
		{
			cont1.style.display = 'none';
		}
	}
}