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) {	
		nt_info_over = newImage("images/nt-info-over.gif");
		nt_classes_over = newImage("images/nt-classes-over.gif");
		nt_schedule_over = newImage("images/nt-schedule-over.gif");
		nt_register_over = newImage("images/nt-register-over.gif");
		nt_contact_over = newImage("images/nt-contact-over.gif");
		
		n_profile_over = newImage("images/n-profile-over.gif");
		n_announce_over = newImage("images/n-announce-over.gif");
		n_links_over = newImage("images/n-links-over.gif");
		n_language_over = newImage("images/n-language-over.gif");
						
		
		n_creative_over = newImage("images/n-creative-over.gif");
		n_technique_over = newImage("images/n-technique-over.gif");
		n_workshop_over = newImage("images/n-workshop-over.gif");

		n_timetable_over = newImage("images/n-timetable-over.gif");
		n_locations_over = newImage("images/n-locations-over.gif");

		n_register_over = newImage("images/n-register-over.gif");
		n_regform_over = newImage("images/n-regform-over.gif");
		
		n_email_over = newImage("images/n-email-over.gif");
		arrow_over = newImage("images/arrow-over.gif");


		preloadFlag = true;
	}
}