function toggleImages(imgName, path1, path2) {
	if (document.getElementById('pastFunded').style.visibility == "hidden")
		document.getElementById(imgName).src = path1;
	else
		document.getElementById(imgName).src = path2;
}
function toggleLayer(layerName)
{
	if (document.getElementById(layerName).style.visibility == "visible") {
		document.getElementById(layerName).style.visibility = "hidden";
		document.getElementById(layerName).style.position = "absolute";		
	} //end if
	else {
		document.getElementById(layerName).style.visibility = "visible";
		document.getElementById(layerName).style.position = "relative";		
	} //end else
}

function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}
<!--

function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		aboutUs_over = newImage("../images/nav/aboutUs-over.gif");
		AboutYellowstone_over = newImage("../images/nav/AboutYellowstone-over.gif");
		projects_over = newImage("../images/nav/projects-over.gif");
		HowYouCanHelp_over = newImage("../images/nav/HowYouCanHelp-over.gif");
		news_over = newImage("../images/nav/news-over.gif");
		partnerships_over = newImage("../images/nav/partnerships-over.gif");
		contactUs_over = newImage("../images/nav/contactUs-over.gif");
		home_over = newImage("../images/nav/home-over.gif");
		makePlanned_over = newImage("../images/nav/makePlanned-over.gif");
		pastFunded_over = newImage("../images/projects/pastFunded-onClick.gif");		
		preloadFlag = true;
	}
}