var  submenu, navstate, timerID ;
var btn1 = new Image(); btn1.src = "images/btn_earlytoys.gif";
var btn1over = new Image(); btn1over.src = "images/btn_earlytoys_over.gif";
var btn2 = new Image(); btn2.src = "images/btn_manipulatives.gif";
var btn2over = new Image(); btn2over.src = "images/btn_manipulatives_over.gif";
var btn3 = new Image(); btn3.src = "images/btn_specialneeds.gif";
var btn3over = new Image(); btn3over.src = "images/btn_specialneeds_over.gif";
var btn4 = new Image(); btn4.src = "images/btn_othertoys.gif";
var btn4over = new Image(); btn4over.src = "images/btn_othertoys_over.gif";
var btnresources = new Image();


function swapin(navstate) {
	clearTimeout(timerID);
	document.image1.src = btn1.src;
	document.image2.src = btn2.src;
	document.image3.src = btn3.src;
	document.image4.src = btn4.src;
	
	if (navstate == "btn1") { document.image1.src = btn1over.src; submenu = "menu1"; }
	if (navstate == "btn2") { document.image2.src = btn2over.src; submenu = "menu2"; }
	if (navstate == "btn3") { document.image3.src = btn3over.src; submenu = "menu3"; }
	if (navstate == "btn4") { document.image4.src = btn4over.src; submenu = "menu4"; }
	if (navstate == "btnresources") {submenu = "menu-resources"; }
	
	
	document.getElementById('menu1').style.display = 'none';
	document.getElementById('menu2').style.display = 'none';
	document.getElementById('menu3').style.display = 'none';
	document.getElementById('menu4').style.display = 'none';
	document.getElementById('menu-resources').style.display = 'none';
	
	if (submenu == "menu1") {document.getElementById('menu1').style.display = '';}
	if (submenu == "menu2") {document.getElementById('menu2').style.display = '';}
	if (submenu == "menu3") {document.getElementById('menu3').style.display = '';}
	if (submenu == "menu4") {document.getElementById('menu4').style.display = '';}
	if (submenu == "menu-resources") {document.getElementById('menu-resources').style.display = '';}

	submenu = "none";
	}