<a href="#null" onclick="document.FormName.reset()"><img src="pic.gif"></a>
method="GET" ACTION="yourpage.htm" in the opening from tag
formname.elements[elementname].value
To confirm that the file you are uploading is correct you can an alert to the "Browse" button
<form name="upload">File to send:
<input type="file" name="myfile" onchange="alert('You have chosen to send:\n\n ' + document.upload.myfile.value)">
</form>