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_home_on = newImage("images/nav_home_on.gif");
		nav_home_off = newImage("images/nav_home.gif");
		nav_how_on = newImage("images/nav_how_on.gif");
		nav_how_off = newImage("images/nav_how.gif");
		nav_ingredients_on = newImage("images/nav_ingredients_on.gif");
		nav_ingredients_off = newImage("images/nav_ingredients.gif");
		nav_testimonials_on = newImage("images/nav_testimonials_on.gif");
		nav_testimonials_off = newImage("images/nav_testimonials.gif");
		nav_questions_on = newImage("images/nav_questions_on.gif");
		nav_questions_off = newImage("images/nav_questions.gif");
		nav_order_on = newImage("images/nav_order_on.gif");
		nav_order_off = newImage("images/nav_order.gif");
		preloadFlag = true;
	}
}