<script language=”javascript” src=”jquery-1.3.2.min.js” type=”text/javascript”>
</script>
<script language=”javascript”>
function example_reset_html(id) {
$(‘#’+id).html($(‘#’+id).html());
}
</script>
<form>
<div style=”float: left;” id=”example_file”><input type=”file” /></div>
<input type=”button” value=”Clear” onclick=”example_reset_html(‘example_file’);” />
</form>
Link: http://www.electrictoolbox.com/clear-upload-file-input-field-jquery/