var ActiveID = "";




function openMenu(nav) {
	document.getElementById(nav).className = "onMenu"
	ActiveID = nav; 
	closeMenuOthers();
}

function closeMenu(nav) {
	document.getElementById(nav).className = "offMenu";
}


function closeMenuOthers() {
	var nav = "nav01";
	if(ActiveID != nav){closeMenu(nav);}
	var nav = "nav02";
	if(ActiveID != nav){closeMenu(nav);}
	var nav = "nav03";
	if(ActiveID != nav){closeMenu(nav);}
}