aboutOn = new Image(48, 12);
aboutOn.src = "images/about-over-button.gif";
aboutOff = new Image(48, 12);
aboutOff.src = "images/about-under-button.gif";

artsOn = new Image(209, 16);
artsOn.src = "images/arts-over-button.gif";
artsOff = new Image(209, 16);
artsOff.src = "images/arts-under-button.gif";

busOn = new Image(64, 12);
busOn.src = "images/busi-over-button.gif";
busOff = new Image(64, 12);
busOff.src = "images/busi-under-button.gif";

calOn = new Image(126, 12);
calOn.src = "images/cal-over-button.gif";
calOff = new Image(126, 12);
calOff.src = "images/cal-under-button.gif";

contOn = new Image(62, 12);
contOn.src = "images/cont-over-button.gif";
contOff = new Image(62, 12);
contOff.src = "images/cont-under-button.gif";

eduOn = new Image(72, 12);
eduOn.src = "images/edu-over-button.gif";
eduOff = new Image(72, 12);
eduOff.src = "images/edu-under-button.gif";

histOn = new Image(58, 12);
histOn.src = "images/hist-over-button.gif";
histOff = new Image(58, 12);
histOff.src = "images/hist-under-button.gif";

homeOn = new Image(96, 12);
homeOn.src = "images/home-over-button.gif";
homeOff = new Image(96, 12);
homeOff.src = "images/home-under-button.gif";

housOn = new Image(60, 16);
housOn.src = "images/hous-over-button.gif";
housOff = new Image(60, 16);
housOff.src = "images/hous-under-button.gif";

medOn = new Image(178, 16);
medOn.src = "images/med-over-button.gif";
medOff = new Image(178, 16);
medOff.src = "images/med-under-button.gif";

recOn = new Image(79, 16);
recOn.src = "images/rec-over-button.gif";
recOff = new Image(79, 16);
recOff.src = "images/rec-under-button.gif";

var where = '';
                   
function show(graphName)
{
	On_Off=eval(graphName + "On.src");
	document.images[graphName].src=On_Off;
}

function hide(graphName)
{
	if (graphName != where)
	{
		Off_On=eval(graphName + "Off.src");
		document.images[graphName].src=Off_On;
	}
}

function clck(graphName)
{
	CLC_On=eval(graphName + "On.src");
	document.images[graphName].src=CLC_On;
	var nea = where;
	where = graphName;
	if (nea != '')
	{
		hide (nea);
	}
}