[jQuery] Corner plugin problem

[jQuery] Corner plugin problem

When i use the corner plugin in combination with .show("slow") this the corners are broken?
Does anyone know why this is hapening?
the code i use is as follow:
    <style type="text/css">
    body           {
                         margin: 0; padding: 0;
                         background: #F0F5E3;font: Verdana,Arial,sans-serif;
                      }
  #wrapper {
                     margin: 0 auto; height: 100%;
                     width: 40em; padding: 10px;
                     background: #ACB0B6; color:#000;
                     }
 h1 { font: 150% Arial, sans-serif; }
  </style>
<script type="text/javascript" src="js/jquery.js"></script>
<script type="text/javascript" src="js/jq-corner.js"></script>
<script type="text/javascript">
    $(document).bind("load", function(){
        $("#wrapper").corner().show("slow");
    });
</script>
    <style type="text/css" title="currentStyle" media="screen">
        @import "";
    </style>
    <link rel="Shortcut Icon" type="image/x-icon" href="" />   
</head>
<body>
<br/>
<div id="wrapper">
<H1>test</H1>    
   test test test
</div>
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