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_getinvolved_over = newImage("images/navigation/nav_getinvolved-over.gif");
		nav_debate_over = newImage("images/navigation/nav_debate-over.gif");
		nav_events_over = newImage("images/navigation/nav_events-over.gif");
		nav_honorroll_over = newImage("images/navigation/nav_honorroll-over.gif");
		nav_donate_over = newImage("images/navigation/nav_donate-over.gif");
		nav_about_over = newImage("images/navigation/nav_about-over.gif");
		// Add preload for timeline image
		timeline_over = newImage("images/home_timeline-over.gif");
		preloadFlag = true;
	}
}