ie8兼容border-radius方法

<!doctype html>
<html>

   <head>
       <meta charset="utf-8" />
   </head>
   <title></title>
   <style>
       .border{ 100px; height: 100px; border-radius: 50%; background: #000;behavior:url("PIE.htc");}
   </style>

   <body>
       <div class="border"></div>
       <script src="js/jquery-1.8.3.min.js"></script>
       <script src="js/PIE.js"></script>
       <script>
           $(function(){
                  if (window.PIE) {
                    $('.border').each(function() {
                        PIE.attach(this);
                    });
                }
           })
       </script>
   </body>

</html>