var menu = new Array('home', 'expertise', 'professionals', 'newsroom', 'contact');
var on = new Array(menu.length);
var off = new Array(menu.length);
for (var i = 0; i < menu.length; i++) {
	on[i] = new Image();
	on[i].src = '/images/nav/' + menu[i] + '_on.gif';
	on[menu[i]] = on[i];
	off[i] = new Image();
	off[i].src = '/images/nav/' + menu[i] + '_off.gif';
	off[menu[i]] = off[i];
}

function menuOn(name) {
	document.images[name].src = on[name].src;
}

function menuOff(name) {
	document.images[name].src = off[name].src;
}