//Show Layer

function showlayer(layer){
	var myLayer=document.getElementById(layer);
	if(myLayer.style.visibility=="hidden" || myLayer.style.visibility==""){
		myLayer.style.visibility="visible";
	}
	else { 
	myLayer.style.visibility="hidden";
	}
}



//Hide Layer

function hidelayer(layer){
	var myLayer=document.getElementById(layer);
	if(myLayer.style.visibility=="visible" || myLayer.style.visibility==""){
		myLayer.style.visibility="hidden";
	}
	else { 
	myLayer.style.visibility="visible";
	}
}