function openOverlay(FotoPath, W)
{
	var Overlay = document.getElementById("Overlay");
	Overlay.style.visibility = 'visible';
	var photoSpan = document.getElementById('OverlayPhoto');
	photoSpan.style.margin = '0px 0px 0px -'+Math.floor(W/2)+ 'px';
	photoSpan.innerHTML = '<img src="'+FotoPath+'">';
}
function closeOverlay()
{
	var Overlay = document.getElementById("Overlay");
	Overlay.style.visibility = 'hidden';
}