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) {
		return_home_over = newImage("graphics/ann/misc/returnnav/return_home-over.gif");
		return_food_over = newImage("graphics/ann/misc/returnnav/return_food-over.gif");
		return_exercise_over = newImage("graphics/ann/misc/returnnav/return_exercise-over.gif");
		return_body_over = newImage("graphics/ann/misc/returnnav/return_body-over.gif");
		return_profile_over = newImage("graphics/ann/misc/returnnav/return_profile-over.gif");
		return_reports_over = newImage("graphics/ann/misc/returnnav/return_reports-over.gif");
		preloadFlag = true;
	}
}