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) {
		ths_03_over = newImage("../../nav/ths_03-over.jpg");
		ths_04_over = newImage("../../nav/ths_04-over.jpg");
		ths_05_over = newImage("../../nav/ths_05-over.jpg");
		ths_06_over = newImage("../../nav/ths_06-over.jpg");
		ths_07_over = newImage("../../nav/ths_07-over.jpg");
		ths_08_over = newImage("../../nav/ths_08-over.jpg");
		btn_01_over = newImage("../img/btn_01-over.gif");
		btn_03_over = newImage("../img/btn_03-over.gif");
		btn_05_over = newImage("../img/btn_05-over.gif");
		preloadFlag = true;
	}
}