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) {
		nav_05_over = newImage("images/rn_top_on_05.jpg");
		nav_06_over = newImage("images/rn_top_on_06.jpg");
		nav_07_over = newImage("images/rn_top_on_07.jpg");
		nav_08_over = newImage("images/rn_top_on_08.jpg");
		nav_09_over = newImage("images/rn_top_on_09.jpg");
		nav_10_over = newImage("images/rn_top_on_10.jpg");
		nav_11_over = newImage("images/rn_top_on_11.jpg");
		nav_12_over = newImage("images/rn_top_on_12.jpg");
		preloadFlag = true;
	}
}

function HideContent(d) {
document.getElementById(d).style.display = "none";
}
function ShowContent(d) {
document.getElementById(d).style.display = "block";
}
function ReverseDisplay(d) {
if(document.getElementById(d).style.display == "none") { document.getElementById(d).style.display = "block"; }
else { document.getElementById(d).style.display = "none"; }
}