(function(){
	var timer=null,
	$sliderContain = $("#slider"),
	$ul = $sliderContain.find(".pics > ul"),
	$li = $ul.children(),
	size = $li.size(),
	index=1,
	slider=function(){
		if(index===size){
			index=0;
		}
		var $tmpLi = $li.eq(index).css({"display":"block","z-index":0,opacity:0}).animate({opacity:1},800);
		$indexLi.animate({opacity:0},800,function(){
			$indexLi.css({"display":"none","z-index":0});
			$indexLi=$tmpLi.css({"z-index":1});
		});
		index++;
	};
	var $indexLi = $li.eq(0);
	timer = setInterval(slider,3000);
})();