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) {
		nav_master_02_over = newImage("images/nav_master_02-over.jpg");
		nav_master_03_nav_master_02_over = newImage("images/nav_master_03-nav_master_02.jpg");
		nav_master_04_over = newImage("images/nav_master_04-over.jpg");
		nav_master_05_nav_master_04_over = newImage("images/nav_master_05-nav_master_04.jpg");
		nav_master_06_over = newImage("images/nav_master_06-over.jpg");
		nav_master_07_nav_master_06_over = newImage("images/nav_master_07-nav_master_06.jpg");
		nav_master_08_over = newImage("images/nav_master_08-over.jpg");
		nav_master_09_nav_master_08_over = newImage("images/nav_master_09-nav_master_08.jpg");
		nav_master_10_over = newImage("images/nav_master_10-over.jpg");
		preloadFlag = true;
	}
}