function showMenu(n) {
	hideAllMenu();
	var el = document.getElementById("menu_" + n);
	if (el != null) {
		el.style.left = event.x;
		el.style.display = "";
	}
}

function hideAllMenu() {

	for (var i = 0; i < 10; i++) {
		var el = document.getElementById("menu_" + i);
		if (el != null) {
			el.style.display = "none";
		}
	}

}