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_about_us_over = newImage("/images/nav-about-us-off.png");
		nav_news_over = newImage("/images/nav-news-off.png");
		nav_artists_over = newImage("/images/nav-artists-off.png");
		nav_consign_over = newImage("/images/nav-consign-off.png");
		nav_find_us_over = newImage("/images/nav-find-us-off.png");
		nav_gallery_over = newImage("/images/nav-gallery-off.png");
		preloadFlag = true;
	}
}