ie6,ie7,firefox兼容CSS

#example { background: #ff0000;width:100px;height:100px } /* Moz/FF/IE8 beta2 */
*html #example { background: #00ff00; } /* IE6 */
*+html #example { background: #0000ff; } /* IE7 */

＜!--[if gte IE 8]>
＜link type="text/css" rel="stylesheet" media="all" href="/sites/default/themes/whitehouse/css/ie8.css" />
＜![endif]-->
＜!--[if lt IE 8]>
＜link type="text/css" rel="stylesheet" media="all" href="/sites/default/themes/whitehouse/css/ie.css" />
＜![endif]-->
＜!--[if IE 6]>
＜link type="text/css" rel="stylesheet" media="all" href="/sites/default/themes/whitehouse/css/ie6.css" />
＜![endif]-->