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) {
		home_over = newImage("images/nav/home-over.gif");
		home_down = newImage("images/nav/home-down.gif");
		why_pr_over = newImage("images/nav/why-pr-over.gif");
		why_pr_down = newImage("images/nav/why-pr-down.gif");
		choose_us_over = newImage("images/nav/choose-us-over.gif");
		choose_us_down = newImage("images/nav/choose-us-down.gif");
		expertise_over = newImage("images/nav/expertise-over.gif");
		expertise_down = newImage("images/nav/expertise-down.gif");
		clients_over = newImage("images/nav/clients-over.gif");
		clients_down = newImage("images/nav/clients-down.gif");
		accolades_over = newImage("images/nav/accolades-over.gif");
		accolades_down = newImage("images/nav/accolades-down.gif");
		key_contacts_over = newImage("images/nav/key-contacts-over.gif");
		key_contacts_down = newImage("images/nav/key-contacts-down.gif");
		news_over = newImage("images/nav/news-over.gif");
		news_down = newImage("images/nav/news-down.gif");
		preloadFlag = true;
	}
}