<html>
<head>
<script type="text/javascript" src="/jquery/jquery.js"></script>
<script type="text/javascript">
var $file;
$(document).ready(function(){
$(":file").live("change",function(){
this.outerHTML += '';
this.value ="";
});
});
</script>
</head>
<body>
<input type="file" id="file"/>
</body>
</html>