如何解决IE6，7，8不支持before:after伪元素_html/css_WEB-ITnose

我有个效果在火狐中是正常的，但在IE下不行。代码如下：

     无标题文档   /*Now the CSS*/* {margin: 0; padding: 0;}.tree ul {	padding-top: 20px; position: relative;		transition: all 0.5s;	-webkit-transition: all 0.5s;	-moz-transition: all 0.5s;}.tree li {	float: left; text-align: center;	list-style-type: none;	position: relative;	padding: 20px 5px 0 5px;		transition: all 0.5s;	-webkit-transition: all 0.5s;	-moz-transition: all 0.5s;}/*We will use :before and :after to draw the connectors*/.tree li:before, .tree li:after{	content: '';	position: absolute; top: 0; right: 50%;	border-top: 1px solid #ccc;	width: 50%; height: 20px;}.tree li:after{	right: auto; left: 50%;	border-left: 1px solid #ccc;}/*We need to remove left-right connectors from elements without any siblings*/.tree li:only-child:after, .tree li:only-child:before {	display: none;}/*Remove space from the top of single children*/.tree li:only-child{ padding-top: 0;}/*Remove left connector from first child and right connector from last child*/.tree li:first-child:before, .tree li:last-child:after{	border: 0 none;}/*Adding back the vertical connector to the last nodes*/.tree li:last-child:before{	border-right: 1px solid #ccc;	border-radius: 0 5px 0 0;	-webkit-border-radius: 0 5px 0 0;	-moz-border-radius: 0 5px 0 0;}.tree li:first-child:after{	border-radius: 5px 0 0 0;	-webkit-border-radius: 5px 0 0 0;	-moz-border-radius: 5px 0 0 0;}/*Time to add downward connectors from parents*/.tree ul ul:before{	content: '';	position: absolute; top: 0; left: 50%;	border-left: 1px solid #ccc;	width: 0; height: 20px;}.tree li a{	border: 1px solid #ccc;	padding: 5px 10px;	text-decoration: none;	color: #666;	font-family: arial, verdana, tahoma;	font-size: 11px;	display: inline-block;		border-radius: 5px;	-webkit-border-radius: 5px;	-moz-border-radius: 5px;		transition: all 0.5s;	-webkit-transition: all 0.5s;	-moz-transition: all 0.5s;}/*Time for some hover effects*//*We will apply the hover effect the the lineage of the element also*/.tree li a:hover, .tree li a:hover+ul li a {	background: #c8e4f8; color: #000; border: 1px solid #94a0b4;}/*Connector styles on hover*/.tree li a:hover+ul li:after, .tree li a:hover+ul li:before, .tree li a:hover+ul:before, .tree li a:hover+ul ul:before{	border-color:  #94a0b4;}/*Thats all. I hope you enjoyed it.Thanks :)*/  
	 		 			Parent			 				 					Child					 						 							Grand Child						 					 				 				 					Child					 						 Grand Child 						 							Grand Child							 								 									Great Grand Child								 								 									Great Grand Child								 								 									Great Grand Child								 							 						 						 Grand Child

      
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