function toggle1() {
	if (document.getElementById('menuNavA1').style.display=='block') {
		document.getElementById('menuNavA1').style.display='none';
	}
	else { document.getElementById('menuNavA1').style.display='block'; }
}

function toggle2() {
	if (document.getElementById('menuNavB1').style.display=='block') {
		document.getElementById('menuNavB1').style.display='none';
	}
	else { document.getElementById('menuNavB1').style.display='block'; }
}

function toggle3() {
	if (document.getElementById('menuNavC1').style.display=='block') {
		document.getElementById('menuNavC1').style.display='none';
	}
	else { document.getElementById('menuNavC1').style.display='block'; }
}

function toggle4() {
	if (document.getElementById('menuNavD1').style.display=='block') {
		document.getElementById('menuNavD1').style.display='none';
	}
	else { document.getElementById('menuNavD1').style.display='block'; }
}

function toggle5() {
	if (document.getElementById('menuNavE1').style.display=='block') {
		document.getElementById('menuNavE1').style.display='none';
	}
	else { document.getElementById('menuNavE1').style.display='block'; }
}

function openall() {
	document.getElementById('menuNavA1').style.display='block';
	document.getElementById('menuNavB1').style.display='block';
	document.getElementById('menuNavC1').style.display='block';
	document.getElementById('menuNavD1').style.display='block';
	document.getElementById('menuNavE1').style.display='block';
}

function clearall() {
	document.getElementById('menuNavA1').style.display="none";
	document.getElementById('menuNavB1').style.display="none";
	document.getElementById('menuNavC1').style.display="none";
	document.getElementById('menuNavD1').style.display="none";
	document.getElementById('menuNavE1').style.display="none";
}

var openbutton = "<h1><a href=\"javascript:openall();\">(open all)</a></h1>"
var closebutton = "<h1><a href=\"javascript:clearall();\">(close all)</a></h1>"
var instructions = "<div id=\"instructions\">Click on categories to reveal and hide links.</div>"