<div id="box">
 <ul id="ul">
  <li style='display:block;'><img src="images/1.jpg" alt=""></li>
  <li><img src="images/2.jpg" alt=""></li>
  <li><img src="images/3.jpg" alt=""></li>
  <li><img src="images/4.jpg" alt=""></li>
  <li><img src="images/5.jpg" alt=""></li>
 </ul>
 <ol id='ol'>
  <li class='active'>1</li>
  <li>2</li>
  <li>3</li>
  <li>4</li>
  <li>5</li>
 </ol>
 </div>

window.onload=function(){
   var oUl=document.getElementById('ul');
   var aLi_u=oUl.getElementsByTagName('li');
   var oOl=document.getElementById('ol');
   var aLi_o=oOl.getElementsByTagName('li');
   for(var i=0;i<aLi_o.length;i++){
    aLi_o[i].index=i;
    aLi_o[i].onmouseover=function(){
     for(var i=0;i<aLi_o.length;i++){
      aLi_o[i].className='';
      aLi_u[i].style.display='none';
     }
     this.className='active';
     // console.log(aLi_o[this.index]);
     aLi_u[this.index].style.display='block';
    }
   }
  }

var oUl=document.getElementById('ul');
var aLi_u=oUl.getElementsByTagName('li');
var oOl=document.getElementById('ol');
var aLi_o=oOl.getElementsByTagName('li');

for(var i=0;i<aLi_o.length;i++){
 aLi_o[i].index=i;
 aLi_o[i].onmouseover=function(){
   for(var i=0;i<aLi_o.length;i++){
    aLi_o[i].className='';
    aLi_u[i].style.display='none';
    aLi_u[i].style.filter='alpha(opacity=0)';
    aLi_u[i].style.opacity=0;
   }
   this.className='active';
   aLi_u[this.index].style.display='block';
   startMove(aLi_u[this.index],{opacity:100});
 };
}

var oUl=document.getElementById('ul');
var aLi_u=oUl.getElementsByTagName('li');
var oOl=document.getElementById('ol');
var aLi_o=oOl.getElementsByTagName('li');
var LiHeight=aLi_u[0].offsetHeight;

for(var i=0;i<aLi_o.length;i++){
 aLi_o[i].index=i;
 aLi_o[i].onmouseover=function(){
  for(var i=0;i<aLi_o.length;i++){
   aLi_o[i].className='';

   this.className='active';

   startMove(oUl,{top:-this.index*LiHeight});
  }
 };
}

window.onload=function(){
 var oBox=document.getElementById('box');
 var oUl=document.getElementById('ul');
 var aLi_u=oUl.getElementsByTagName('li');
 var oOl=document.getElementById('ol');
 var aLi_o=oOl.getElementsByTagName('li');
 var LiHeight=aLi_u[0].offsetHeight;
 var iNow=0;//当前索引
 var timer=null;//定时器

 for(var i=0;i<aLi_o.length;i++){
  aLi_o[i].index=i;
  aLi_o[i].onmouseover=function(){
   for(var i=0;i<aLi_o.length;i++){
    aLi_o[i].className='';

    this.className='active';
    //建立关系：很重要
    iNow=this.index;

    startMove(oUl,{top:-this.index*LiHeight});
   }
  };
 //开定时器
 timer=setInterval(toRun,2000);

 oBox.onmouseover=function(){
  clearInterval(timer);
 };
 oBox.onmouseout=function(){
  timer=setInterval(toRun,2000);
 };
 //定时函数
 function toRun(){
  if(iNow==aLi_o.length-1){
   iNow=0;
  }else{
   iNow++;
  }

  for(var i=0;i<aLi_o.length;i++){
   aLi_o[i].className='';
  }
  aLi_o[iNow].className='active';
  startMove(oUl,{top:-iNow*LiHeight});
 }
};