如果是IE浏览器则选择all-ie-only.css

<!--[if IE]>

	<link rel="stylesheet" type="text/css" href="all-ie-only.css" />

<![endif]-->

如果不是ie浏览器则选择not-ie.css

<!--[if !IE]><!-->

	<link rel="stylesheet" type="text/css" href="not-ie.css" />

 <!--<![endif]-->

一下是不同ie浏览器选择的不同css标准

Target only IE 7

<!--[if IE 7]>

	<link rel="stylesheet" type="text/css" href="ie7.css">

<![endif]-->

Target only IE 6

<!--[if IE 6]>

	<link rel="stylesheet" type="text/css" href="ie6.css" />

<![endif]-->

Target only IE 5

<!--[if IE 5]>

	<link rel="stylesheet" type="text/css" href="ie5.css" />

<![endif]-->

Target only IE 5.5

<!--[if IE 5.5000]>

<link rel="stylesheet" type="text/css" href="ie55.css" />

<![endif]-->

Target IE 6 and lower

<!--[if lt IE 7]>

	<link rel="stylesheet" type="text/css" href="ie6-and-down.css" />

<![endif]-->

<!--[if lte IE 6]>

	<link rel="stylesheet" type="text/css" href="ie6-and-down.css" />

<![endif]-->

Target IE 7 and lower

<!--[if lt IE 8]>

	<link rel="stylesheet" type="text/css" href="ie7-and-down.css" />

<![endif]-->

<!--[if lte IE 7]>

	<link rel="stylesheet" type="text/css" href="ie7-and-down.css" />

<![endif]-->

Target IE 8 and lower

<!--[if lt IE 9]>

	<link rel="stylesheet" type="text/css" href="ie8-and-down.css" />

<![endif]-->

<!--[if lte IE 8]>

	<link rel="stylesheet" type="text/css" href="ie8-and-down.css" />

<![endif]-->

Target IE 6 and higher

<!--[if gt IE 5.5]>

	<link rel="stylesheet" type="text/css" href="ie6-and-up.css" />

<![endif]-->

<!--[if gte IE 6]>

	<link rel="stylesheet" type="text/css" href="ie6-and-up.css" />

<![endif]-->

Target IE 7 and higher

<!--[if gt IE 6]>

	<link rel="stylesheet" type="text/css" href="ie7-and-up.css" />

<![endif]-->

<!--[if gte IE 7]>

	<link rel="stylesheet" type="text/css" href="ie7-and-up.css" />

<![endif]-->

Target IE 8 and higher

<!--[if gt IE 7]>

	<link rel="stylesheet" type="text/css" href="ie8-and-up.css" />

<![endif]-->

<!--[if gte IE 8]>

	<link rel="stylesheet" type="text/css" href="ie8-and-up.css" />

<![endif]-->