var openedMenu = null;
var submenuTimer;

//メニューマウスオーバー
function menuOvr(id){
	if (openedMenu && openedMenu != id){
		CloseMenu(id);
	}
	OpenMenu(id);
}
//メニューマウスアウト
function menuOut(id){
	submenuTimer = setTimeout('CloseMenu()', 100);
}

//レイヤメニューの表示
function OpenMenu(id){ 
	if ( document.getElementById ){
		obj = document.getElementById("submenu" + id).style.visibility = 'visible';
	}else if ( document.all ){
		obj = document.all("submenu" + id).style.visibility = 'visible';
	}else if ( document.layers ){
		obj = document.layers["submenu" + id].visibility = 'show';
	}
	clearTimeout(submenuTimer);
	openedMenu = id;
}

//レイヤメニューの削除
function CloseMenu(){ 
	if ( document.getElementById ){
		obj = document.getElementById("submenu" + openedMenu ).style.visibility = 'hidden';
	}else if ( document.all ){
		obj = document.all("submenu" + openedMenu ).style.visibility = 'hidden';
	}else if ( document.layers ){
		obj = document.layers["submenu" + openedMenu ].visibility = 'hide';
	}
	openedMenu = null;
}