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) {
		id1968_over = newImage("images/1968-over.gif");
		id1969_over = newImage("images/1969-over.gif");
		id1972_over = newImage("images/1972-over.gif");
		id1996_over = newImage("images/1996-over.gif");
		id2000_over = newImage("images/2000-over.gif");
		id2004_over = newImage("images/2004-over.gif");
		id2005_over = newImage("images/2005-over.gif");
		timeline_TEMPLATE_12_2005_over = newImage("images/timeline_TEMPLATE_12-2005_o.gif");
		timeline_TEMPLATE_12_1968_over = newImage("images/timeline_TEMPLATE_12-1968_o.gif");
		timeline_TEMPLATE_12_1969_over = newImage("images/timeline_TEMPLATE_12-1969_o.gif");
		timeline_TEMPLATE_12_1972_over = newImage("images/timeline_TEMPLATE_12-1972_o.gif");
		timeline_TEMPLATE_12_1996_over = newImage("images/timeline_TEMPLATE_12-1996_o.gif");
		timeline_TEMPLATE_12_2000_over = newImage("images/timeline_TEMPLATE_12-2000_o.gif");
		timeline_TEMPLATE_12_2004_over = newImage("images/timeline_TEMPLATE_12-2004_o.gif");
		preloadFlag = true;
	}
}