// JavaScript Document

var nsfLogo = document.getElementById("nsfLogo");
var nsfAcknowledgment = document.getElementById("nsfAcknowledgment");

nsfLogo.onmouseover = revealNsfAcknowledgment;
nsfAcknowledgment.onmouseout = revealNsfLogo;

function revealNsfAcknowledgment(){
	nsfLogo.style.visibility = "hidden";
	nsfAcknowledgment.style.visibility = "visible";
}

function revealNsfLogo(){
	nsfAcknowledgment.style.visibility = "hidden";
	nsfLogo.style.visibility = "visible";
}