js带缩略图的图片切换效果

 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

 <html xmlns="http://www.w3.org/1999/xhtml">

 <head>

 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

 <title>听说你也是——文字控</title>

 <link href="css/css.css" rel="stylesheet" type="text/css" />

 <SCRIPT src="js/js.js" type=text/javascript></SCRIPT>

 </head>

 <body>

 <div id="ifocus">

  <div id="ifocus_pic">

   <div id="ifocus_piclist" style="left:0; top:0;">

    <ul>

     <li><a href="#"><img src="img/01.jpg" alt="" /></a></li>

     <li><a href="#"><img src="img/02.jpg" alt="" /></a></li>

     <li><a href="#"><img src="img/03.jpg" alt="" /></a></li>

     <li><a href="#"><img src="img/04.jpg" alt="" /></a></li>

    </ul>

   </div>

   <div id="ifocus_opdiv"></div>

   <div id="ifocus_tx">

    <ul>

     <li class="current">忧伤在我心中沉静下来，宛如降临在寂静山林中的夜色</li>

     <li class="normal">我就像一只停泊在海滩上的小船，聆听着晚潮奏</li>

     <li class="normal">生命是上天赋予的，我们惟有献出生命，才能真正得到它</li>

     <li class="normal">今天大地在阳光下向我细语，用一种已被遗忘的语言</li>

    </ul>

   </div>

  </div>

  <div id="ifocus_btn">

   <ul>

    <li class="current"><img src="img/btn_01.jpg" alt="" /></li>

    <li class="normal"><img src="img/btn_02.jpg" alt="" /></li>

    <li class="normal"><img src="img/btn_03.jpg" alt="" /></li>

    <li class="normal"><img src="img/btn_04.jpg" alt="" /></li>

   </ul>

  </div>

 </div>

 </body>

 </html>

 @charset "utf-8";

 /* CSS Document */

 *

 {

     margin:0;

     padding:0;

     word-break:break-all;

  }

 body

 {

     background:#FFF;

      color:#333;

      font:12px/1.6em Helvetica, Arial, sans-serif;

      }

 h1, h2, h3, h4, h5, h6

 {

      font-size:1em;

 }

 a

 {

     color:#0287CA;

     text-decoration:none; }

 a:hover

  {

       text-decoration:underline;

       }

 ul, li

 {

 list-style:none;

  }

 fieldset, img

 {

 border:none;

  }

 legend

 {

 display:none;

  }

 em, strong, cite, th {

      font-style:normal;

      font-weight:normal;

       }

 input, textarea, select, button {

      font:12px Helvetica, Arial, sans-serif;

      }

 table {

      border-collapse:collapse;

       }

 html {

      overflow:-moz-scrollbars-vertical;

       } 

 #ifocus {

     width:525px;

     height:245px;

       margin:20px;

     border:1px solid #DEDEDE;

     background:#F8F8F8;

      }

  #ifocus_pic

  {

       display:inline;

       position:relative;

       float:left;

       width:410px;

       height:225px;

       overflow:hidden;

       margin:10px 0 0 10px;

       }

 #ifocus_piclist {

 position:absolute;

  }

 #ifocus_piclist li {

      width:410px;

      height:225px;

      overflow:hidden;

  }

 #ifocus_piclist img {

      width:410px;

       height:225px;

       }

 #ifocus_btn {

      display:inline;

      float:right;

      width:91px;

      margin:9px 9px 0 0;

      }

 #ifocus_btn li { 

      width:91px;

      height:57px;

      cursor:pointer;

      opacity:0.5;

       -moz-opacity:0.5;

       filter:alpha(opacity=50);

       }

 #ifocus_btn img {

      width:75px;

     height:45px;

     margin:7px 0 0 11px;

     }

 #ifocus_btn .current {

      background: url(i/ifocus_btn_bg.gif) no-repeat;

      opacity:1; -moz-opacity:1; filter:alpha(opacity=100);

      }

 #ifocus_opdiv {

       position:absolute;

       left:0;

       bottom:0;

       width:410px;

        height:35px;

         background:#000;

          opacity:0.5;

          -moz-opacity:0.5;

          filter:alpha(opacity=50);

    }

 #ifocus_tx {

   position:absolute;

   left:8px;

   bottom:8px;

   color:#FFF; }

 #ifocus_tx .normal {

   display:none;

   }

 function $(id) { return document.getElementById(id); }

 function addLoadEvent(func){

  var oldonload = window.onload;

  if (typeof window.onload != 'function') {

   window.onload = func;

  } else {

   window.onload = function(){

    oldonload();

    func();

   }

  }

 }

 function moveElement(elementID,final_x,final_y,interval) {

   if (!document.getElementById) return false;

   if (!document.getElementById(elementID)) return false;

   var elem = document.getElementById(elementID);

   if (elem.movement) {

     clearTimeout(elem.movement);

   }

   if (!elem.style.left) {

     elem.style.left = "0px";

   }

   if (!elem.style.top) {

     elem.style.top = "0px";

   }

   var xpos = parseInt(elem.style.left);

   var ypos = parseInt(elem.style.top);

   if (xpos == final_x && ypos == final_y) {

   return true;

   }

   if (xpos < final_x) {

     var dist = Math.ceil((final_x - xpos)/10);

     xpos = xpos + dist;

   }

   if (xpos > final_x) {

     var dist = Math.ceil((xpos - final_x)/10);

     xpos = xpos - dist;

   }

   if (ypos < final_y) {

     var dist = Math.ceil((final_y - ypos)/10);

     ypos = ypos + dist;

   }

   if (ypos > final_y) {

     var dist = Math.ceil((ypos - final_y)/10);

     ypos = ypos - dist;

   }

   elem.style.left = xpos + "px";

   elem.style.top = ypos + "px";

   var repeat = "moveElement('"+elementID+"',"+final_x+","+final_y+","+interval+")";

   elem.movement = setTimeout(repeat,interval);

 }

 function classNormal(iFocusBtnID,iFocusTxID){

  var iFocusBtns= $(iFocusBtnID).getElementsByTagName('li');

  var iFocusTxs = $(iFocusTxID).getElementsByTagName('li');

  for(var i=0; i<iFocusBtns.length; i++) {

   iFocusBtns[i].className='normal';

   iFocusTxs[i].className='normal';

  }

 }

 function classCurrent(iFocusBtnID,iFocusTxID,n){

  var iFocusBtns= $(iFocusBtnID).getElementsByTagName('li');

  var iFocusTxs = $(iFocusTxID).getElementsByTagName('li');

  iFocusBtns[n].className='current';

  iFocusTxs[n].className='current';

 }

 function iFocusChange() {

  if(!$('ifocus')) return false;

  $('ifocus').onmouseover = function(){atuokey = true};

  $('ifocus').onmouseout = function(){atuokey = false};

  var iFocusBtns = $('ifocus_btn').getElementsByTagName('li');

  var listLength = iFocusBtns.length;

  iFocusBtns[0].onmouseover = function() {

   moveElement('ifocus_piclist',0,0,5);

   classNormal('ifocus_btn','ifocus_tx');

   classCurrent('ifocus_btn','ifocus_tx',0);

  }

  if (listLength>=2) {

   iFocusBtns[1].onmouseover = function() {

    moveElement('ifocus_piclist',0,-225,5);

    classNormal('ifocus_btn','ifocus_tx');

    classCurrent('ifocus_btn','ifocus_tx',1);

   }

  }

  if (listLength>=3) {

   iFocusBtns[2].onmouseover = function() {

    moveElement('ifocus_piclist',0,-450,5);

    classNormal('ifocus_btn','ifocus_tx');

    classCurrent('ifocus_btn','ifocus_tx',2);

   }

  }

  if (listLength>=4) {

   iFocusBtns[3].onmouseover = function() {

    moveElement('ifocus_piclist',0,-675,5);

    classNormal('ifocus_btn','ifocus_tx');

    classCurrent('ifocus_btn','ifocus_tx',3);

   }

  }

 }

 setInterval('autoiFocus()',5000);

 var atuokey = false;

 function autoiFocus() {

  if(!$('ifocus')) return false;

  if(atuokey) return false;

  var focusBtnList = $('ifocus_btn').getElementsByTagName('li');

  var listLength = focusBtnList.length;

  for(var i=0; i<listLength; i++) {

   if (focusBtnList[i].className == 'current') var currentNum = i;

  }

  if (currentNum==0&&listLength!=1 ){

   moveElement('ifocus_piclist',0,-225,5);

   classNormal('ifocus_btn','ifocus_tx');

   classCurrent('ifocus_btn','ifocus_tx',1);

  }

  if (currentNum==1&&listLength!=2 ){

   moveElement('ifocus_piclist',0,-450,5);

   classNormal('ifocus_btn','ifocus_tx');

   classCurrent('ifocus_btn','ifocus_tx',2);

  }

  if (currentNum==2&&listLength!=3 ){

   moveElement('ifocus_piclist',0,-675,5);

   classNormal('ifocus_btn','ifocus_tx');

   classCurrent('ifocus_btn','ifocus_tx',3);

  }

  if (currentNum==3 ){

   moveElement('ifocus_piclist',0,0,5);

   classNormal('ifocus_btn','ifocus_tx');

   classCurrent('ifocus_btn','ifocus_tx',0);

  }

  if (currentNum==1&&listLength==2 ){

   moveElement('ifocus_piclist',0,0,5);

   classNormal('ifocus_btn','ifocus_tx');

   classCurrent('ifocus_btn','ifocus_tx',0);

  }

  if (currentNum==2&&listLength==3 ){

   moveElement('ifocus_piclist',0,0,5);

   classNormal('ifocus_btn','ifocus_tx');

   classCurrent('ifocus_btn','ifocus_tx',0);

  }

 }

 addLoadEvent(iFocusChange);

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