function showOverlay1() {
		document.getElementById("overlay1").style.display = "block";
} 
function closeOverlay1()
{
		document.getElementById("overlay1").style.display = "none";	
}

function showOverlay2() {
		document.getElementById("overlay2").style.display = "block";
} 
function closeOverlay2()
{
		document.getElementById("overlay2").style.display = "none";	
}

function showOverlay3() {
		document.getElementById("overlay3").style.display = "block";
} 
function closeOverlay3()
{
		document.getElementById("overlay3").style.display = "none";	
}

function showOverlay4() {
		document.getElementById("overlay4").style.display = "block";
} 
function closeOverlay4()
{
		document.getElementById("overlay4").style.display = "none";	
}