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) {
		history_over = newImage("images/s-history-over.gif");
		history_down = newImage("images/s-history-down.gif");
		events_over = newImage("images/s-events-over.gif");
		events_down = newImage("images/s-events-down.gif");
		newsletters_over = newImage("images/s-newsletters-over.gif");
		newsletters_down = newImage("images/s-newsletters-down.gif");
		people_over = newImage("images/s-people-over.gif");
		people_down = newImage("images/s-people-down.gif");
		photos_over = newImage("images/s-photos-over.gif");
		photos_down = newImage("images/s-photos-down.gif");
		relatedlinks_over = newImage("images/s-relatedlinks-over.gif");
		relatedlinks_down = newImage("images/s-relatedlinks-down.gif");
		joinus_down = newImage("images/s-joinus-down.gif");
		joinus_over = newImage("images/s-joinus-over.gif");
		preloadFlag = true;
	}
}