// menu effects                     
//                                  
// var openedMenuId is set via php  
function toggleMenu(id) {
	if ($(id).style.display == 'none') {
		// close opened menus
		if (openedMenuId.length != 0)
			menuClose(openedMenuId);
		menuOpen(id);
		// store which menu is currently opened
		openedMenuId = id;
	}
	else {
		menuClose(id);
		// store that all menus are closed
		openedMenuId = '';
	}
}

function menuClose(id) {
	new Effect.BlindUp(id, {duration: 0.8});
}

function menuOpen(id) {
	new Effect.BlindDown(id, {duration: 0.8});
}