function body_onLoad() {
	var screenOverlay = document.getElementById("screenOverlay");

	screenOverlay.style.visibility = "hidden";
	screenOverlay.style.display = "block";
}

function body_onUnload() {
	var screenOverlay = document.getElementById("screenOverlay");

	screenOverlay.style.visibility = "visible";
	screenOverlay.style.display = "block";
}