var timer1;
var timer2;

function submenu1Appear() {
	clearTimeout(timer1);
	document.getElementById('submenu_vbox').style.visibility="hidden";
	document.getElementById('submenu_nagara').style.visibility="visible";
}

function submenu1Disappear() {
	document.getElementById('submenu_nagara').style.visibility="hidden";
}

function submenu2Appear() {
	clearTimeout(timer2);
	document.getElementById('submenu_nagara').style.visibility="hidden";
	document.getElementById('submenu_vbox').style.visibility="visible";
}

function submenu2Disappear() {
	document.getElementById('submenu_vbox').style.visibility="hidden";
}