一个可以js（JavaScript）的tab标签切换代码，可以自动适应宽度，可以自己添加删除标签块，傻瓜式操作便能完成！
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3c.org/TR/1999/REC-html401- 19991224/loose.dtd"> <HTML xmlns="http://www.w3.org/1999/xhtml"><HEAD> <meta name="keywords" content="JS代码,TAB标签,JS广告代码,JS特效代码,阅微草堂" /> <title>自适应宽度的标签导航</title> <META http-equiv=Content-Type content="text/html; charset=gb2312"> <STYLE type=text/css> BODY {FONT-SIZE: 14px; FONT-FAMILY: "宋体"} OL LI { MARGIN: 8px} #con { FONT-SIZE: 12px; MARGIN: 0px auto; WIDTH: 600px} #tags { PADDING-RIGHT: 0px; PADDING-LEFT: 0px; PADDING-BOTTOM: 0px; MARGIN: 0px 0px 0px 10px; WIDTH: 400px; PADDING- TOP: 0px; HEIGHT: 23px} #tags LI {BACKGROUND: url(images/tagleft.gif) no-repeat left bottom; FLOAT: left; MARGIN-RIGHT: 1px; LIST-STYLE-TYPE: none; HEIGHT: 23px} #tags LI A {PADDING-RIGHT: 10px; PADDING-LEFT: 10px; BACKGROUND: url(images/tagright.gif) no-repeat right bottom; FLOAT: left; PADDING-BOTTOM: 0px; COLOR: #999; LINE-HEIGHT: 23px; PADDING-TOP: 0px; HEIGHT: 23px; TEXT-DECORATION: none} #tags LI.emptyTag {BACKGROUND: none transparent scroll repeat 0% 0%; WIDTH: 4px} #tags LI.selectTag {BACKGROUND-POSITION: left top; MARGIN-BOTTOM: -2px; POSITION: relative; HEIGHT: 25px} #tags LI.selectTag A {BACKGROUND-POSITION: right top; COLOR: #000; LINE-HEIGHT: 25px; HEIGHT: 25px} #tagContent { PADDING-RIGHT: 1px; BORDER: #aecbd4 1px solid; PADDING-LEFT: 1px; PADDING-BOTTOM: 1px; PADDING-TOP: 1px; BACKGROUND-COLOR: #fff} .tagContent {PADDING-RIGHT: 10px; DISPLAY: none; PADDING-LEFT: 10px; BACKGROUND: url(images/bg.gif) repeat-x; PADDING-BOTTOM: 10px; WIDTH: 576px; COLOR: #474747; PADDING-TOP: 10px; HEIGHT: 250px} #tagContent DIV.selectTag {DISPLAY: block} </STYLE> <META content="MSHTML 6.00.2800.1589" name=GENERATOR></HEAD> <BODY> <DIV id=con> <UL id=tags> <LI class=selectTag><A onMouseover="selectTag('tagContent0',this)" href="javascript:void(0)">标签一</A> </LI> <LI><A onMouseover="selectTag('tagContent1',this)" href="javascript:void(0)">标签二</A> </LI> <LI><A onMouseover="selectTag('tagContent2',this)" href="javascript:void(0)">自适应宽度的标签</A> </LI> <LI><A onMouseover="selectTag('tagContent3',this)" href="javascript:void(0)">自适应宽度</A> </LI> </UL> <DIV id=tagContent> <DIV class=tagContent id=tagContent0>第一个标签的内容</DIV> <DIV class="tagContent selectTag" id=tagContent1>第二个标签的内容</DIV> <DIV class=tagContent id=tagContent2>第三个标签的内容</DIV> <DIV class=tagContent id=tagContent3>第四个标签的内容</DIV> </DIV> </DIV> <SCRIPT type=text/javascript> function selectTag(showContent,selfObj){ // 操作标签 var tag = document.getElementById("tags").getElementsByTagName("li"); var taglength = tag.length; for(i=0; i<taglength; i++){ tag[i].className = ""; } selfObj.parentNode.className = "selectTag"; // 操作内容 for(i=0; j=document.getElementById("tagContent"+i); i++){ j.style.display = "none"; } document.getElementById(showContent).style.display = "block"; } </SCRIPT> </BODY></HTML>