function hideDiv(div){
var el = document.getElementById(div);
	if (el){
	el.style.visibility = "hidden";
	el.style.display = "none";
	}
}
function showDiv(div){
var el = document.getElementById(div);
	if (el){
	el.style.visibility = "visible";
	el.style.display = "block";
	}
}