// JavaScript Document

jQuery(function($){
 //焦点图
var MyTimer;

var len = $("#focus_pic_s_list > li").length;
var index = 0;
var showtime = 1;

showImg(index,len);

$("#focus_pic_s_list li").click(function(){
   index = $("#focus_pic_s_list li").index(this);
   showImg(index,len);
   showtime=index+1;
});

var MyTime = setInterval(function(){
	showImg(showtime,len);
	showtime++;
	if(showtime>=len){showtime=0;}
	} , 8000);
})

var go_left;
var go_right;
var focus_pic_s_list;
	go_left=document.getElementById('go_left');
	go_right=document.getElementById('go_right');
	focus_pic_s_list=$(".focus_pic_s_list")

	go_right.onclick=function (){
		
		var i = focus_pic_s_list.find('img').length;//算出一共多少张图片
		var w = (i-5)*116; //总长
		
		if(focus_pic_s_list.scrollLeft()!==w)
		{
			focus_pic_s_list.scrollLeft(focus_pic_s_list.scrollLeft()+116);
		}
	}

	go_left.onclick=function (){
		focus_pic_s_list.scrollLeft(focus_pic_s_list.scrollLeft()-116);
	}
	
//关键函数：通过控制i ，来显示不同的幻灯片
function showImg(i,len){
   	$("#focus_pic_s_list li").eq(i).addClass("cur_pic").siblings().removeClass("cur_pic");
	$("#focus_pic_list li").eq(i).fadeIn(800).siblings("li").fadeOut(600);
	
	if(i>2&&i<len-2){
		focus_pic_s_list.scrollLeft((i-2)*116);
	}else if(i<3){
		focus_pic_s_list.scrollLeft(focus_pic_s_list.scrollLeft(0));
	}else if(i>len-3){
		if(len>5){
			focus_pic_s_list.scrollLeft((len-5)*116);
		}else{
			focus_pic_s_list.scrollLeft(focus_pic_s_list.scrollLeft(0));
		}
	}
}