function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		Circle_over = newImage(gRootDir + "images/circle-over.gif");
		scrollArrow_up_over = newImage(gRootDir + "images/scrollArrow_up-over.gif");
		scrollArrow_down_over = newImage(gRootDir + "images/scrollArrow_down-over.gif");
		preloadFlag = true;
	}
}