淘宝顶部菜单旋转三角形符号, CSS _HTML/CSS

淘宝顶部菜单旋转三角符号, CSS
<html>
<head>
<link rel="stylesheet" href="css/reset.css" type="text/css"></link>
<link rel="stylesheet" href="css/global.css" type="text/css"></link>
<script type="text/javascript" src="js/jquery-1.6.1.min.js"></script>
<script type="text/javascript">
$(function(){
	 $('#bTag').hover(function(){
	 	$(this).addClass('hoverb');
	 },function(){
	 	$(this).removeClass('hoverb');
	 });
});
</script>
<style type="text/css">
.b {
position: absolute;
right: 10px;
top: 7px;
width: 0;
height: 0;
border-width: 4px 4px;
border-style: solid;
border-color: #666 whiteSmoke whiteSmoke;
font-size: 0;
line-height: 0;
-webkit-transition: -webkit-transform .2s ease-in;
-webkit-backface-visibility: hidden;
-moz-transition: -moz-transform .2s ease-in;
-o-transition: -o-transform .2s ease-in;
transition: transform .2s ease-in;
}
.hoverb {
border-color: #666 white white white;
-moz-transform: rotate(180deg);
-moz-transform-origin: 50% 30%;
-webkit-transform: rotate(180deg);
-webkit-transform-origin: 50% 30%;
-o-transform: rotate(180deg);
-o-transform-origin: 50% 30%;
transform: rotate(180deg);
transform-origin: 50% 30%;
filter: progid:DXImageTransform.Microsoft.BasicImage(rotation=2);
top: 3px	9;
}
</style>
</head>
<body>
<div style="position: relative; width: 100px; height: 50px;">
<b class="b" id="bTag"></b>
</div>
</body>
</html>