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) {
		menu_up_bt_registrati_sopra = newImage("images/menu_up_bt_registrati-sopra.gif");
		menu_up_bt_login_sopra = newImage("images/menu_up_bt_login-sopra.gif");
		menu_up_bt_disclaimer_sopra = newImage("images/menu_up_bt_disclaimer-sopra.gif");
		menu_up_bt_mission_sopra = newImage("images/menu_up_bt_mission-sopra.gif");
		menu_up_bt_chisiamo_sopra = newImage("images/menu_up_bt_chisiamo-sopra.gif");
		menu_up_bt_contatti_sopra = newImage("images/menu_up_bt_contatti-sopra.gif");
		menu_up_bt_mappa_sopra = newImage("images/-menu_up_bt_mappa-sopra.gif");
		menu_sx_bt_forum_sopra = newImage("images/menu_sx_bt_forum-sopra.gif");
		menu_sx_bt_biblio_sopra = newImage("images/menu_sx_bt_biblio-sopra.gif");
		menu_sx_bt_directory_sopra = newImage("images/menu_sx_bt_directory-sopra.gif");
		menu_sx_bt_archivio_sopra = newImage("images/menu_sx_bt_archivio-sopra.gif");
		menu_sx_bt_animali_sopra = newImage("images/menu_sx_bt_animali-sopra.gif");
		menu_sx_bt_cucinare_sopra = newImage("images/menu_sx_bt_cucinare-sopra.gif");
		menu_sx_bt_film_sopra = newImage("images/menu_sx_bt_film-sopra.gif");
		menu_sx_bt_chefare_sopra = newImage("images/menu_sx_bt_chefare-sopra.gif");
		menu_sx_bt_viaggi_sopra = newImage("images/menu_sx_bt_viaggi-sopra.gif");
		menu_sx_bt_maternita_sopra = newImage("images/menu_sx_bt_maternita-sopra.gif");
		menu_sx_bt_adozione_sopra = newImage("images/menu_sx_bt_adozione-sopra.gif");
		preloadFlag = true;
	}
}