var imageRoot = '/images/';
var preloadFlag = false;

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 = imageRoot + changeImages.arguments[i+1];
		}
	}
}

function preloadImages() {
	if (document.images) {
		news_home_o = newImage(imageRoot + "bt_news_home_o.gif");
		links_home_o = newImage(imageRoot + "bt_links_home_o.gif");
		donations_home_o = newImage(imageRoot + "bt_donations_home_o.gif");
		gallery_home_o = newImage(imageRoot + "bt_gallery_home_o.gif");
		messageboard_home_o = newImage(imageRoot + "bt_messageboard_home_o.gif");
		contact_home_o = newImage(imageRoot + "bt_contact_home_o.gif");
		pets_home_o = newImage(imageRoot + "bt_pets_home_o.gif");
		
		news_gallery_o = newImage(imageRoot + "bt_news_gallery_o.gif");
		links_gallery_o = newImage(imageRoot + "bt_links_gallery_o.gif");
		donations_gallery_o = newImage(imageRoot + "bt_donations_gallery_o.gif");
		gallery_gallery_o = newImage(imageRoot + "bt_gallery_gallery_o.gif");
		messageboard_gallery_o = newImage(imageRoot + "bt_messageboard_gallery_o.gif");
		contact_gallery_o = newImage(imageRoot + "bt_contact_gallery_o.gif");
		pets_gallery_o = newImage(imageRoot + "bt_pets_gallery_o.gif");		
		
		news_pets_o = newImage(imageRoot + "bt_news_pets_o.gif");
		links_pets_o = newImage(imageRoot + "bt_links_pets_o.gif");
		donations_pets_o = newImage(imageRoot + "bt_donations_pets_o.gif");
		gallery_pets_o = newImage(imageRoot + "bt_gallery_pets_o.gif");
		messageboard_pets_o = newImage(imageRoot + "bt_messageboard_pets_o.gif");
		contact_pets_o = newImage(imageRoot + "bt_contact_pets_o.gif");
		pets_pets_o = newImage(imageRoot + "bt_pets_pets_o.gif");				

		preloadFlag = true;
	}
}