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<!--jquery should be included before any other js-->
<script type="text/javascript" language="javascript" src="/simple_ajax
+_cgi_example/jquery-1.2.6.js"></script>
<script type="text/javascript" language="javascript" src="/simple_ajax
+_cgi_example/simple_ajax_cgi_example.js"></script>
...

</body>
</html>

$(document).ready(function () {
    $("#file").change(function() {
        $("#form1").submit();
...
function callback(msg) {
    $("#msg").html(msg);
}

#!/usr/bin/perl

use warnings;
...
print "<script>parent.callback('upload file success')</script>";

exit;