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) {
		gn_home_over = newImage("/common/images/gn-home_over.gif");
		gn_home_down = newImage("/common/images/gn-home_down.gif");
		gn_news_over = newImage("/common/images/gn-news_over.gif");
		gn_news_down = newImage("/common/images/gn-news_down.gif");
		gn_shops_over = newImage("/common/images/gn-shops_over.gif");
		gn_shops_down = newImage("/common/images/gn-shops_down.gif");
		gn_floormap_over = newImage("/common/images/gn-floormap_over.gif");
		gn_floormap_down = newImage("/common/images/gn-floormap_down.gif");
		gn_about_over = newImage("/common/images/gn-about_over.gif");
		gn_about_down = newImage("/common/images/gn-about_down.gif");
		gn_access_over = newImage("/common/images/gn-access_over.gif");
		gn_access_down = newImage("/common/images/gn-access_down.gif");
		gn_recruit_over = newImage("/common/images/gn-recruit_over.gif");
		gn_recruit_down = newImage("/common/images/gn-recruit_down.gif");
		preloadFlag = true;
	}
}