经过多次改进，可以在普通网站上直接使用了，现在发布源程序下载（编码为utf-8，改为gb3212的方法是：用记事本打开，另存时选择相应的编码），希望对大家有用（虽然不一定实用）。
因为只是标签导航,所有内容还会在频道页中体现,所在全部用AJAX读取。

功能的实现思路：

雅虎中国

• 单击触发
• <A>块锁定:a{display:block;height:16px;}/*将A锁定为块级,再定义高度和宽度*/
• 再次单击弹出链接:在<A>标记的onclick事件中需要执行读取时,return false;否则return true;
• AJAX读取数据
• 数据暂存
• 窗口平滑收缩

<!--由于我看不懂雅虎的代码,所以使用了一些基本的代码去实现这些功能,可能效率不高,不过效果是出来了.-->

网易

• 鼠标滑过延时触发: onmouseover时var waitInterval=window.setTimeout("func();",300);onmouseout时clearTimeout(waitInterval);
• <A>块锁定、AJAX读取数据、数据暂存、窗口平滑收缩

其它功能：

• cookie记忆
• 最后读取数据的服务器时间
• 滑动门技术

在线效果：
http://www.lorlo.com/tab.html

源码下载：点击这里下载源文件

JS文件分析：

代码拷贝框
function getObject(objectId) {     if(document.getElementById && document.getElementById(objectId)) {    // W3C DOM       return document.getElementById(objectId);     }      else if (document.all && document.all(objectId)) {    // MSIE 4 DOM       return document.all(objectId);     }      else if (document.layers && document.layers[objectId]) {    // NN 4 DOM.. note: this won't find nested layers       return document.layers[objectId];     }      else {       return false;    }} var responsecont;var xmlHttp;var xH=new Object();var rqtp=new Object();var dateStr,dStr;var requestType;var etype=0;var newsstring;var ajccache=new Object();var url;var MouseDelayTime=200;//鼠标感应延迟var waitInterval;var Browser = new Object();Browser.isMozilla = (typeof document.implementation != 'undefined') && (typeof document.implementation.createDocument != 'undefined') && (typeof HTMLDocument!='undefined');Browser.isIE = window.ActiveXObject ? true : false;Browser.isFirefox = (navigator.userAgent.toLowerCase().indexOf("firefox")!=-1);Browser.isOpera = (navigator.userAgent.toLowerCase().indexOf("opera")!=-1);function SetCookie(name,value,expires){//写cookievar exp=new Date();exp.setTime(exp.getTime() expires*60000);document.cookie=name "=" escape(value) ";expires=" exp.toGMTString();// ";domain=arkoo.com;path=/";} function readcookie(name){//读取cookievar oRegex=new RegExp(name '=([^;] )','i');var oMatch=oRegex.exec(document.cookie);if(oMatch&&oMatch.length>1)return unescape(oMatch[1]);else return '';}function CreateXMLHttpRequest(){   // Initialize Mozilla XMLHttpRequest object   if (window.XMLHttpRequest){       xmlHttp = new XMLHttpRequest();   }    // Initialize for IE/Windows ActiveX version   else if (window.ActiveXObject) {       try{            xmlHttp = new ActiveXObject("Msxml2.XMLHTTP.3.0");       }        catch (e){            try{            xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");            }            catch (e){newsstring = "<div class='loading'>Loading rquest content fail, Please try it again latter...</div>";}       }   }}function getnews(tagid,x){url = "tab/" tagid '_' x '.html';var url2=url;requestType = tagid;if(ajccache[url]==null){var loadstatustext="<div class='loading'><img src='tab/images/loading.gif' /> Loading request content, please wait...</div>";rqtp[tagid]=tagid;CreateXMLHttpRequest();   var hdr=tagid;   xH[tagid]=xmlHttp;   if(etype==1)getObject(requestType '_cnt').innerHTML = loadstatustext;   xH[tagid].onreadystatechange = function(){   // only if xmlHttp shows "complete"   if (xH[tagid].readyState == 4){      // only http 200 to process      if (window.location.href.indexOf("http")==-1 || xH[tagid].status == 200){         newsstring = xH[tagid].responseText;    dateStr=xH[tagid].getResponseHeader("Date");    dStr = new Date(dateStr);SetCookie('dStr',dStr,10000000);         //inject centent to tab-pane            shownews(rqtp[tagid],newsstring);            ajccache[url2]=newsstring;      }   }}   xH[tagid].open("GET", url, true);   xH[tagid].setRequestHeader("If-Modified-Since","0");   xH[tagid].send(null);}else{shownews(requestType,ajccache[url]);}}function shownews(requestType,newsstring){//<![CDATA[    responsecont = getObject(requestType '_cnt');    responsecont.innerHTML = newsstring;    getObject("pdate").innerHTML=dStr;if(getObject("alta")){ata(getObject("alta"));hideText();}//]]>}function TabNews(tagid,x){    var lim=getObject(tagid "_mn").getElementsByTagName('li');    var mnt=getObject(tagid "_mn").getElementsByTagName('li').length;    if(!mnt)mnt=4;    for(var i=0;i<mnt;i  ){        if(i == (x-1)){            if(i==0){                lim[i].className="tabactive1";            }            else{                lim[i].className="tabactive2";                lim[i-1].getElementsByTagName('a')[0].style.background="url()";            }            lim[i].getElementsByTagName('a')[0].style.background="url(tab/images/tab_bgs.gif) right -60px no-repeat";            try{getnews(tagid,x);}catch(e){alert(e);}        }            else{            lim[i].className="";            lim[i].getElementsByTagName('a')[0].style.background="url(tab/images/tab_bgs.gif) right -88px no-repeat";                }    }}var idn,tmpa,tmpat;var aw="";var rT;function aet(tagid,etp){var lis=getObject(tagid "_mn").getElementsByTagName('li');var wts=tagid "_cnt";var wnf=tagid "info";if(readcookie(tagid "_cntd")=="none"){    hiddenList(getObject(wts));    maxh[wts]=readcookie(tagid "_cnth");    getObject("pdate").innerText=readcookie("dStr");    }else{    if(parseInt(readcookie(wnf))>1)    TabNews(tagid,readcookie(wnf));//返回上次访问    else    TabNews(tagid,1);    if(etp==1)aw=tagid readcookie(wnf);}    for(var iy=0;iy<lis.length;iy  ){        with(lis[iy]){        if(etp==0){        lis[iy].onmouseover=function(){            rT=attributes.getNamedItem('id').value.substring(0, attributes.getNamedItem('id').value.length-1);            if(getObject(rT '_cnt').style.display != "none"&&className!="") return;            idn=parseInt(attributes.getNamedItem('id').value.substring(attributes.getNamedItem('id').value.length-1, attributes.getNamedItem('id').value.length));            clearTimeout(waitInterval);            waitInterval=window.setTimeout("etype=0;TabNews(rT,idn);if(getObject(rT '_cnt').style.display == 'none')displayList(rT '_cnt'); SetCookie(rT 'info',idn,10000000);SetCookie(rT '_cntd','ture',10000000);",MouseDelayTime);            }        lis[iy].onmouseout=function(){if(getObject(rT '_cnt').style.display != "none"&&className!="") return;clearTimeout(waitInterval);}        }         if(etp==1){        lis[iy].onmouseover=function(){getElementsByTagName('a')[0].blur();}        lis[iy].onclick=function(){             idn=parseInt(attributes.getNamedItem('id').value.substring(attributes.getNamedItem('id').value.length-1, attributes.getNamedItem('id').value.length));            rT=attributes.getNamedItem('id').value.substring(0, attributes.getNamedItem('id').value.length-1);            if(getObject(rT '_cnt').style.display != "none"&&(idn==1&&(this.className=="tabactive1")||aw==attributes.getNamedItem('id').value)) return true;                if(getObject(rT '_cnt').style.display == "none"){                 displayList(rT '_cnt');SetCookie(rT '_cntd','ture',10000000);                }            etype=1;            TabNews(rT,idn);            SetCookie(rT 'info',idn,10000000);            aw=attributes.getNamedItem('id').value;            getElementsByTagName('a')[0].blur();            return false;            }}}    }} function ata(objid){var as=objid.getElementsByTagName('a');for(var i=0;i<as.length;i  ){as[i].target="_self";}}function GetUrlParam(paramName){    //获取URL参数的函数    var oRegex = new RegExp('[\?&]'   paramName   '=([^&] )', 'i');    var oMatch = oRegex.exec(window.location.search);    if(oMatch && oMatch.length > 1)        return oMatch[1];    else        return '';}function hideText(){if(document.getElementsByTagName("arkoo:title").length==0){var upu=GetUrlParam("username");var upa=GetUrlParam("articleid");getObject("closeit").innerHTML='<a href="http://cn.arkoo.com/diaryfiles/showpage.aspx?username=' upu '&articleid=' upa '" target="_blank">查看原文</a> <a href="tab.html" target="_self">×</a>';}}var maxh=new Object();//显示内容框function displayList(oid){        var h = 0;      var objid=getObject(oid);          if(isNaN(parseInt(maxh[oid]))) var max_h = 210; // 容器的最大高度        else             var max_h = maxh[oid];          var anim = function(){                                h  = 50; // 每次递增50像素                    if(h >= max_h){                     objid.style.height = max_h   "px";;                     getObject('tab' objid.attributes.getNamedItem('id').value).style.background="url(tab/images/tab_bgs.gif) 5px -113px no-repeat"; // 让图片标签改变背景                               if(tt){window.clearInterval(tt);}                     }                    else{                 objid.style.display="block";                 objid.style.height = h   "px";                    }            }                             var tt = window.setInterval(anim,2);      }// 隐藏列表框function hiddenList(objid){       var h = objid.offsetHeight;           var anim = function(){                 h -= 50; // 每次递减50像素                 if(h <= 5){                 objid.style.display="none";                    getObject('tab' objid.attributes.getNamedItem('id').value).style.background="url(tab/images/tab_bgs.gif) -14px -114px no-repeat";                    if(tt){window.clearInterval(tt);}               }               else{                   objid.style.height = h   "px";               }           }                        var tt = window.setInterval(anim,2); }function showClassList(oid){var objid=getObject(oid);   if(objid.style.display == "none"){    if(objid.getElementsByTagName("img").length==0)TabNews(oid.substring(0,oid.indexOf("_")),1);       displayList(oid); // 显示内容框    SetCookie(oid 'd',"ture",10000000);   }   else{      if(isNaN(parseInt(maxh[oid]))){         if(Browser.isFirefox){            maxh[oid]=objid.offsetHeight;      }      else{         maxh[oid]=objid.offsetHeight; // 内容容器的初始高度          }      }      hiddenList(objid); // 隐藏内容框     SetCookie(oid 'd',"none",10000000);SetCookie(oid 'h',maxh[oid],10000000);   }}</div><BR>[Ctrl A 全部选择 然后拷贝]</P></div>    </li></li></li></li></li></li></li></li>

作者：gdgzboy@牛C网
地址：http://www.niuc.net/post/2612/
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