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_02_over = newImage("images/nav_02-over.gif");
		nav_02_down = newImage("images/nav_02-down.gif");
		nav_03_over = newImage("images/nav_03-over.gif");
		nav_03_down = newImage("images/nav_03-down.gif");
		nav_04_over = newImage("images/nav_04-over.gif");
		nav_04_down = newImage("images/nav_04-down.gif");
		nav_05_over = newImage("images/nav_05-over.gif");
		nav_05_down = newImage("images/nav_05-down.gif");
		nav_06_over = newImage("images/nav_06-over.gif");
		nav_06_down = newImage("images/nav_06-down.gif");
		nav_07_over = newImage("images/nav_07-over.gif");
		nav_07_down = newImage("images/nav_07-down.gif");
		programs_02_over = newImage("images/programs_02-over.gif");
		programs_02_down = newImage("images/programs_02-down.gif");
		programs_03_over = newImage("images/programs_03-over.gif");
		programs_03_down = newImage("images/programs_03-down.gif");
		programs_04_over = newImage("images/programs_04-over.gif");
		programs_04_down = newImage("images/programs_04-down.gif");
		programs_05_over = newImage("images/programs_05-over.gif");
		programs_05_down = newImage("images/programs_05-down.gif");
		programs_06_over = newImage("images/programs_06-over.gif");
		programs_06_down = newImage("images/programs_06-down.gif");
		programs_07_over = newImage("images/programs_07-over.gif");
		programs_07_down = newImage("images/programs_07-down.gif");
		preloadFlag = true;
	}
}