function togglePopover(id) 
{
var state = document.getElementById(id).style.display;
	if (state == 'block') {
		document.getElementById(id).style.display = 'none';
		document.getElementById(id).style.opacity = '0';
		document.getElementById('closePopover').style.display = 'none';
	} else {
		document.getElementById(id).style.display = 'block';
		document.getElementById(id).style.opacity = '1';
		document.getElementById('closePopover').style.display = 'block';
	}
}

function closePopover()
{
	document.getElementById('closePopover').style.display = 'none';
	document.getElementById('about').style.display = 'none';
}