jsp+css实现图片自动轮换

jsp文件（片段）

<div id="ifocus">
<div id="ifocus_pic">
<div id="ifocus_piclist" style="left:0; top:0;">
<ul>
<li><a href="http://slide.news.sina.com.cn/s/slide_1_2841_17440.html" target="_blank"><img src='<%=path%>/images/picture/2011050903.jpg' alt="" /></a></li>
<li><a href="http://news.sina.com.cn/c/p/20101202/17289496.shtml" target="_blank"><img src='<%=path%>/images/picture/2011050901.jpg' alt="" /></a></li>
<li><a href="http://blog.sina.com.cn/u/1565088014" target="_blank"><img src='<%=path%>/images/picture/meinv/wangruoyi(2).jpg' alt="" /></a></li>
<li><a href="http://news.sina.com.cn/c/p/20101227/12109533.shtml" target="_blank"><img src='<%=path%>/images/picture/2011050902.jpg' alt="" /></a></li>
</ul>
</div>
<div id="ifocus_opdiv"></div>
<div id="ifocus_tx">
<ul>
<li class="current">云南空乘招募吸引众多俊男美女</li>
<li class="normal">女大学生学做痛经操</li>
<li class="normal">王若伊</li>
<li class="normal">陕西华县发现巨大地窖挖掘出数吨宋代古钱币</li>
</ul>
</div>
</div>
<div id="ifocus_btn">
<ul>
<li class="current"><img src='<%=path%>/images/picture/2011050903.jpg' alt="" /></li>
<li class="normal"><img src='<%=path%>/images/picture/2011050901.jpg' alt="" /></li>
<li class="normal"><img src='<%=path%>/images/picture/meinv/wangruoyi(2).jpg' alt="" /></li>
<li class="normal"><img src='<%=path%>/images/picture/2011050902.jpg' alt="" /></li>
</ul>
</div>
</div>

css文件

fieldset, img { border:none; }

#ifocus { width:477px; height:245px; margin:0px; border:1px solid #DEDEDE; background:#F8F8F8;}

#ifocus_pic { display:inline; position:relative; float:right; width:370px; height:225px; overflow:hidden; margin:10px 0 0 10px; }
#ifocus_piclist { position:absolute; }
#ifocus_piclist li { width:380px; height:225px; overflow:hidden; }
#ifocus_piclist img { width:380px; height:225px; }

#ifocus_btn { display:inline; float:right; width:91px; margin:4px 4px 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:48px; margin:7px 0 0 11px; }
#ifocus_btn .current { background: url(img/ifocus_btn_bg.gif) no-repeat; opacity:1; -moz-opacity:1; filter:alpha(opacity=100); }

#ifocus_opdiv { position:absolute; left:0; bottom:0; width:375px; 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; }

js文件

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 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';
}

setInterval('autoiFocus()',2500);
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);

效果图

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