var menuCount = 3;
var menu = new Array ();

function menuItem () {
	this.on = false;
	this.opacity = 40;
}

function menuInit () {
	for (var i = 0; i < menuCount; i++) {
		menu[i] = new menuItem ();
	}
	setInterval('updateMenu()', 50);
}

function menuOn (i) {
	menu[i].on = true;
}

function menuOff (i) {
	menu[i].on = false;
}

function updateMenu () {
	for (var i = 0; i < menuCount; i++) {
		if (menu[i].on) {
			document.getElementById('menu'+i).style.backgroundColor='#DCDCDC';
			if (menu[i].opacity < 100) {
				menu[i].opacity += 10;
				document.getElementById('menu'+i+'img').style.filter = 'Alpha(opacity='+menu[i].opacity+')';
			}
		} else {
			document.getElementById('menu'+i).style.backgroundColor='transparent';
			if (menu[i].opacity > 40) {
				menu[i].opacity -= 5;
				document.getElementById('menu'+i+'img').style.filter = 'Alpha(opacity='+menu[i].opacity+')';
			}
		}
	}
}