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(imageset) {
	if (document.images) {
	switch(imageset) {
		case("nav"):
		home_over = newImage("/images/home/nav/home_over.gif");
		current_issue_over = newImage("/images/home/nav/current_issue_over.gif");
		destinations_over = newImage("/images/home/nav/destinations_over.gif");
		topics_over = newImage("/images/home/nav/topics_over.gif");
		photography_over = newImage("/images/home/nav/photography_over.gif");
		contributors_over = newImage("/images/home/nav/contributors_over.gif");
		events_over = newImage("/images/home/nav/events_over.gif");
		search_over = newImage("/images/home/nav/search_over.gif");
		break;
		
		case("nav_columns"):
		travel_tips_over = newImage("/images/home/side_columns/travel_tips_over.gif");
		cruises_over = newImage("/images/home/side_columns/cruises_over.gif");
		disability_over = newImage("/images/home/side_columns/disability_over.gif");
		sports_over = newImage("/images/home/side_columns/sports_over.gif");
		happenings_over = newImage("/images/home/side_columns/happenings_over.gif");
		on_assignment_over = newImage("/images/home/side_columns/on_assignment_over.gif");
		luxury_over = newImage("/images/home/side_columns/luxury_over.gif");
		adventure_over = newImage("/images/home/side_columns/adventure_over.gif");
		senior_over = newImage("/images/home/side_columns/senior_over.gif");
		photo_tips_over = newImage("/images/home/side_columns/photo_tips_over.gif");
		archives_over = newImage("/images/home/side_columns/archives_over.gif");
		break;
		
		case("footer"):
		about_twi_over = newImage("/images/footer/about_twi_over.gif");
		about_natja_over = newImage("/images/footer/about_natja_over.gif");
		about_ewnb_over = newImage("/images/footer/about_ewnb_over.gif");
		inquiries_over = newImage("/images/footer/inquiries_over.gif");
		advertise_over = newImage("/images/footer/advertise_over.gif");
        sitemap_over = newImage("/images/footer/sitemap_over.gif");
		break;
		
		}
		preloadFlag = true;
	}
}