又一淘宝网的TAB选项卡，很圆滑

答案：<html>
<head>
<title>淘宝网的TAB选项卡</title>
<style>
body {font-size:12px;}
ul.TabBarLevel1{
	list-style:none;
	margin:0;
	padding:0;
	height:29px;
	background-image:url(/jscss/demoimg/200906/tabbar_level1_bk.gif);
}
ul.TabBarLevel1 li{
	float:left;
	padding:0;
	height:29px;
	margin-right:1px;
	background:url(/jscss/demoimg/200906/tabbar_level1_slice_left_bk.gif) left top no-repeat;
}
ul.TabBarLevel1 li a{
	display:block;
	line-height:29px;
	padding:0 20px;
	color:#333;
	background:url(/jscss/demoimg/200906/tabbar_level1_slice_right_bk.gif) right top no-repeat;
	white-space: nowrap;
}
ul.TabBarLevel1 li.Selected{
	background:url(/jscss/demoimg/200906/tabbar_level1_slice_selected_left_bk.gif) left top no-repeat;
}
ul.TabBarLevel1 li.Selected a{
	background:url(/jscss/demoimg/200906/tabbar_level1_slice_selected_right_bk.gif) right top no-repeat;
}

ul.TabBarLevel1 li a:link,ul.TabBarLevel1 li a:visited{
	color:#333;
}
ul.TabBarLevel1 li a:hover,ul.TabBarLevel1 li a:active{
	color:#F30;
	text-decoration:none;
}
ul.TabBarLevel1 li.Selected a:link,ul.TabBarLevel1 li.Selected a:visited{
	color:#000;
}
ul.TabBarLevel1 li.Selected a:hover,ul.TabBarLevel1 li.Selected a:active{
	color:#F30;
	text-decoration:none;
}
div.HackBox {
  padding : 2px 2px ;
  border-left: 2px solid #6697CD;
  border-right: 2px solid #6697CD;
  border-bottom: 2px solid #6697CD;
}

</style>
</head>
<body>
<div id="Whatever">
	<ul class="TabBarLevel1" id="TabPage1">
		<li id="Tab1"><a href="#" onclick="javascript:switchTab('TabPage1','Tab1');">宝贝详情</a></li>
		<li  id="Tab2" class="Selected"><a href="#" onclick="javascript:switchTab('TabPage1','Tab2');">其他信息</a></li>
		<li  id="Tab3"><a href="#" onclick="javascript:switchTab('TabPage1','Tab3');">出价记录</a></li>
		<li  id="Tab4"><a href="#" onclick="javascript:switchTab('TabPage1','Tab4');">留言簿</a></li>
	</ul>
</div>
<script language="JavaScript">

function switchTab(tabpage,tabid){
        var oItem = document.getElementById(tabpage);   
	for(var i=0;i<oItem.children.length;i++){
		var x = oItem.children(i);	
		x.className = "";
		var y = x.getElementsByTagName('a');
		y[0].style.color="#333333";
	}	
	document.getElementById(tabid).className = "Selected";
}
</script>
</body>
</html>
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