function toggle_visibility(id) {
	var e = document.getElementById(id);
	if(e.style.display == 'block')
	e.style.display = 'none';
	else
	e.style.display = 'block';
}

function toggle_visibility2(id,id2) {
	var e = document.getElementById(id);
	var e2 = document.getElementById(id2);
	if(e.style.display == 'block')
	{
	e.style.display = 'none';
	e2.style.display = 'block';
	}
	else
	{
	e.style.display = 'block';
	e2.style.display = 'none';
	}
}

function toggle_visibility3(id,id2,id3) {
	var e = document.getElementById(id);
	var e2 = document.getElementById(id2);
	var e3 = document.getElementById(id3);
	if(e.style.display == 'block')
	{
	e.style.display = 'none';
	e2.style.display = 'none';
	e3.style.display = 'block';
	}
	else
	{
	e.style.display = 'block';
	e2.style.display = 'block';
	e3.style.display = 'none';
	}
}