function hidePopup()
{
	var popup = document.getElementById('popupBox');
	
	popup.style.visibility = 'hidden';
	popup.style.width = '0px';
	popup.style.height = '0px';
	
}
function showPopup()
{
	var popup = document.getElementById('popupBox');
	var h;
	var w;
	if (self.innerWidth)
	{
		h = self.innerHeight;
	}
	else if (document.documentElement && document.documentElement.clientHeight)
	{
		h = document.documentElement.clientHeight;
	}
	else if (document.body)
	{
		h = document.body.clientHeight;
	}	
	h = h - 37;
	//var h = (screen.height * 0.60);
	var w = (h / 0.543);
	popup.style.width = w + 'px';
	popup.style.height = h + 'px';	
	popup.style.visibility = 'visible';
	//alert(h + 'x' + w + " ratio : " + w/h);
}