CSS+Js遮罩效果的TAB及焦点图片切换(推荐)

<!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=gb2312" /> 
<title>Js遮罩效果的TAB及图片切换</title> 
<style> 
div, ul, ol, li, dl, dt, dd { 
margin:0; 
padding:0; 
} 
.imgFlash,.tab{margin:auto} 
/*------焦点图片的css-------*/ 
.imgFlash { 
height:230px;width:270px; 
position:relative; 
} 
.imgFlash dl { 
    height:100%; 
    overflow:hidden; 
    position:absolute; 
    width:100%; 
} 
.imgFlash img { 
    height:100%; 
    position:absolute; 
    width:100%; 
    background-color: #FFFFFF; 
    background-repeat: no-repeat; 
    background-position: center center; 
} 
.imgFlash dt { 
bottom:0; 
font-size:12px; 
height:24px;line-height:24px; 
left:0; 
position:absolute; 
width:100%; 
z-index:1; 
} 
.imgFlash dt span { 
    background-color:#000000; 
    height:100%; 
    opacity:0.4;filter:Alpha(Opacity=40); 
    position:absolute; 
    width:100%; 
} 
.imgFlash dt a { 
color:#FFFFFF; 
position:absolute; 
text-decoration:none; 
text-indent:5px; 
z-index:1; 
} 
.imgFlash dt a:hover { 
text-decoration:underline; 
} 
.imgFlash div { 
bottom:8px; 
cursor:pointer; 
display:block; 
position:absolute; 
right:8px; 
z-index:99999; 
} 
.imgFlash div em { 
background-color:#000000; 
border:1px solid #FFFFFF; 
display:block; 
float:right; 
height:4px; 
margin-right:3px; 
filter:Alpha(Opacity=50);opacity:0.5; 
overflow:hidden; 
width:4px; 
} 
.imgFlash div em.d {/*激活的小方块的样式*/ 
background-color:#CC0000; 
filter:Alpha(Opacity=80); 
opacity:0.8; 
} 
/*-------------------------Tab的css----------------------------*/ 
.tab,.tab ul{list-style-type: none;} 
.tab{ 
    width:270px; 
    background-color:#FFFFFF; 
    height: 160px; 
    font-size: 12px; 
    position: relative; 
    border-top-width: 30px; 
    border-right-width: 1px; 
    border-bottom-width: 1px; 
    border-left-width: 1px; 
    border-top-style: solid; 
    border-right-style: solid; 
    border-bottom-style: solid; 
    border-left-style: solid; 
    border-top-color: #0066FF; 
    border-right-color: #0066FF; 
    border-bottom-color: #0066FF; 
    border-left-color: #0066FF; 
} 
.tab ul { 
    position: absolute; 
    top: -30px; 
} 
.tab li{ 
    float:left; 
    background-color:#A9CEEB; 
    background-repeat:no-repeat; 
    background-position:left top; 
    margin-top:5px; 
    margin-left: 5px; 
} 
.tab li.d { 
    background-color: #FFFFFF; 
} 
.tab li a{text-decoration:none;display:block;padding-right:8px;padding-left:8px;line-height:25px;color:#2B6FA2;} 
.tab li.d a{color:#0C3E74;} 
.tab li ul{ 
    border-bottom-style:none; 
    position:absolute; 
    left:0px; 
    top:30px; 
    background-color: #FFFFFF; 
    padding-top: 10px; 
    width: 270px; 
} 
.tab li li{ 
    float:none; 
    background-image:none; 
    margin:0px; 
    background-color: #FFFFFF; 
} 
.tab li li a{ 
    background-image:none; 
    line-height:22px; 
    color: #000000; 
    float: none; 
    height: 22px; 
} 
.tab li ul li a:hover{text-decoration:underline;} 
.tab li.d li a{color:#000000;} 
</style> 
<script language="javascript"> 
var $ = function (d){return document.getElementById( d );}; 
var isIE = (document.all) ? true : false; 
var Bind = function (obj,fun,arr){return function() {arr || (arr = arguments);return fun.apply(obj,arr);}};//绑定 
var Tween = function(t,b,c,d){return c*t/d + b;};//缓冲函数 
function addEventHandler(oTarget, sEventType, fnHandler) {if (oTarget.addEventListener) {oTarget.addEventListener(sEventType, fnHandler, false);} else if (oTarget.attachEvent) {oTarget.attachEvent("on" + sEventType, fnHandler);} else {oTarget["on" + sEventType] = fnHandler; 
    } 
};//事件监听 
function removeEventHandler(oTarget, sEventType, fnHandler) { 
if (oTarget.removeEventListener) { 
oTarget.removeEventListener(sEventType, fnHandler, false); 
} else if (oTarget.detachEvent) { 
oTarget.detachEvent("on" + sEventType, fnHandler); 
} else { 
oTarget["on" + sEventType] = null; 
} 
};//移除监听

[Ctrl+A 全选注:如需引入外部Js需刷新才能执行]

其实这个不只是效果，代码也是非常值得学习的。大家主要是注意页面最下面的代码
<script>
new ImgFlash($("box"));//初始化
new Tab($("tab1"),"mouseover");
</script>

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