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) {
		nav1s_on = newImage("images/nav/download_pdf-on.gif");
		nav1s_off = newImage("images/nav/download_pdf-off.gif");
		nav2s_on = newImage("images/nav/exit-on.gif");
		nav2s_off = newImage("images/nav/exit-off.gif");
		nav1_on = newImage("images/nav/our_brands-on.gif");
		nav1_off = newImage("images/nav/our_brands-off.gif");
		nav2_on = newImage("images/nav/our_values-on.gif");
		nav2_off = newImage("images/nav/our_values-off.gif");
		nav3_on = newImage("images/nav/letter_shareholders-on.gif");
		nav3_off = newImage("images/nav/letter_shareholders-off.gif");
		nav4_on = newImage("images/nav/financial_highlights-on.gif");
		nav4_off = newImage("images/nav/financial_highlights-off.gif");
		nav5_on = newImage("images/nav/corporate_info-on.gif");
		nav5_off = newImage("images/nav/corporate_info-off.gif");
		
		preloadFlag = true;
	}
}