document.onmouseover = hideAllMenus;
document.onclick = hideAllMenus;
window.onerror = null;

function showMenu(menuNumber, eventObj) {
	hideAllMenus();
	eventObj.cancelBubble = true;
	var menuId = 'menu' + menuNumber;
	if(set_object_visibility(menuId, true)) {
		return true;
	} else {
		return false;
    }
}

function hideAllMenus() {
	for(i=1; i<=numMenus; i++) {
		set_object_visibility('menu' + i, false);
    }
}