bulletinBoard.js

var bulletinBoard = {
				OPTIONS: {
					$wrap: '',
					interval: 3000,
					switchTime: 1000
				},
				cache: {},
				init: function(options) {
					var me = this,
						ca = me.cache;
					$.extend(me.OPTIONS, options);
					ca.$bulletins = me.OPTIONS.$wrap.find('.bulletin');
					var $active = ca.$bulletins.eq(0).addClass('active');
					ca.length = ca.$bulletins.length;
					ca.active = 0;
					$active.css({
						top: 0
					});
					ca.$active = $active;
					setInterval(function() {
						me.switch();
					}, me.OPTIONS.interval);
				},
				switch: function() {
					var me = this,
						ca = me.cache;
					ca.$active.animate({
							top: '-100%'
						}, me.OPTIONS.switchTime)
						.removeClass('active');
					ca.active = (ca.active + 1) % ca.length;
					var $to = ca.$bulletins.eq(ca.active);
					ca.$active = $to.css({
							top: '100%'
						})
						.animate({
							top: 0
						}, me.OPTIONS.switchTime)
						.addClass('active');
				}
			};
			bulletinBoard.init({
				$wrap: ca.$bulletinBoard
			});