(function ($) {
	$.fn.extend({
		Scroll: function (opt, callback) {
			if (!opt) var opt = {};
			var toint = function (str) {
				if (str == null || str == 'auto' || str.length <= 0) {
					str = 0;
				} else {
					str = parseInt(str);
				}
				return str;
			}
			var _btnUp = $(opt.up);
			var _btnDown = $(opt.down);
			var timerID;
			var _this = this.eq(0).find("ul:first");
			var lineH = _this.find("li:first").width(),
				line = opt.line ? parseInt(opt.line, 10) : parseInt(this.width() / lineH, 10),
				speed = opt.speed ? parseInt(opt.speed, 10) : 500;
			timer = opt.timer;

			if (line == 0) line = 1;
			var upHeight = 0 - line * lineH;


			_this.parent().css({ overflow: 'hidden' });
			var getWidth = function () {
				var _curli = _this.find("li:first");
				upHeight = 0 - _curli.height() - toint(_curli.css('margin-top')) - toint(_curli.css('margin-bottom'));
				return upHeight;
			}
			var scrollUp = function () {
				_btnUp.unbind("click", scrollUp);
				_this.animate({
					marginTop: getWidth()
				}, speed, function () {
					for (i = 1; i <= line; i++) {
						_this.find("li:first").appendTo(_this);
					}
					_this.css({ marginTop: 0 });
					_btnUp.bind("click", scrollUp);
				});
				return false;
			}
			var scrollDown = function () {
				_btnDown.unbind("click", scrollDown);
				for (i = 1; i <= line; i++) {
					_this.find("li:last").show().prependTo(_this);
				}
				_this.css({ marginTop: getWidth() });
				_this.animate({
					marginTop: 0
				}, speed, function () {
					_btnDown.bind("click", scrollDown);
				});
				return false;
			}
			var autoPlay = function () {
				if (timer) timerID = window.setInterval(scrollUp, timer);
				return false;
			};
			var autoStop = function () {
				if (timer) window.clearInterval(timerID);
				return false;
			};
			//_this.parent().hover(autoStop,autoPlay).mouseout();
			_btnUp.css("cursor", "pointer").click(scrollUp);
			_btnDown.css("cursor", "pointer").click(scrollDown);
			if (timer) timerID = window.setInterval(scrollUp, timer);
		}
	})
})(jQuery);