(function($) {
	$.fn.slider = function(settings) {
		/*
		*tag: 滑动的标签
		*time: 两次滑动的间隔
		*speed: 一次滑动的时间
		*/
		settings = $.extend({
			tag:"li",
			time:3000,
			speed:800
		}, settings);
		
		return this.each(function(){
			var containter = $(this);
			var height = 0 - containter.find(settings.tag).eq(0).height();
			
			var slider = function(){
				containter.animate({top:height},
					settings.speed,
					function(){
						containter.find(settings.tag).eq(0).appendTo(this);
						$(this).css({top:0});
					}
				);
				return this;
			}
			
			var timer = 0; //定时器
			var int=setInterval(function(){slider();}, settings.time);
			
			//鼠标在li上悬停时停止动画
			$(this).find(settings.tag).hover(function(){
				int=window.clearInterval(int);
				},
				function(){
					int=setInterval(function(){slider();
				},
				settings.time);
			});
		});
	};
})(jQuery);