浏览器兼容 ： IE 5 到 IE 9

<!--[if IE]>
<link href="ie.css" rel="stylesheet">
<![endif]-->

<!--[if IE6]>
<style type="text/css">
/* styles for IE6 goes here */
</style>
<![endif]-->

<!--[if lt IE7]>
<style type="text/css">
/* styles for IE7 goes here */
</style>
<![endif]-->

<!--[if lte IE8]>
<style type="text/css">
/* styles for IE8 goes here */
</style>
<![endif]-->

<!--[if gt IE9]>
<style type="text/css">
/* styles for IE9 goes here */
</style>
<![endif]-->

<!--[if gte IE9]>
<style type="text/css">
/* styles for IE9 goes here */
</style>
<![endif]-->

<!--[if !IE]> -->
<style type="text/css">
/* styles goes here but should not appear in IE5-9 */
</style>
<!-- <![endif]-->