var menuselected = null;

function on(imageon){
	if (imageon != menuselected) {
		document.images[imageon].src = "_images/" + imageon + "_on.gif";
	}
}

function off(imageoff){
	if (imageoff != menuselected) {
		document.images[imageoff].src = "_images/" + imageoff + "_off.gif";
	}
}

function menu(menuon){
	menuselected = menuon;
	document.images[menuon].src = "_images/" + menuon + "_on.gif";
}

function preload(){
	menu1 = new Image(); menu1.src = "_images/_menu_home_on.gif";
	menu2 = new Image(); menu2.src = "_images/_menu_biography_on.gif";
	menu3 = new Image(); menu3.src = "_images/_menu_news_on.gif";
	menu4 = new Image(); menu4.src = "_images/_menu_reviews_on.gif";
	menu5 = new Image(); menu5.src = "_images/_menu_recordings_on.gif";
	menu6 = new Image(); menu6.src = "_images/_menu_schedule_on.gif";
	menu7 = new Image(); menu7.src = "_images/_menu_photographs_on.gif";
	menu8 = new Image(); menu8.src = "_images/_menu_contact_on.gif";
	menu9 = new Image(); menu9.src = "_images/_menu_email_on.gif";
}