Gotpix.com JS/JQuery Profile BG Upload

<script type="text/javascript">
    $(function() {
        $("#uploadFile").click(function(e) {
            // User clicks form input field and default click action is prevented
            $("#fileUploadField").click();
            e.preventDefault();

            // Once a user clicks they will fire the form action
            $("#fileUploadField").change(function() {

                // iframe HTML
                var iframe = $('<iframe name="postiframe" id="postiframe" target="postiframe" style="display: none;" /></iframe>');

                // Append said iframe
                $("body").append(iframe);

                // Let's submit the form to process on the backend
                var form = $('#UploadForm');
                form.attr("action", "./includes/objects/profile_bg_upload.php");
                form.attr("method", "post");
                form.attr("enctype", "multipart/form-data");
                form.attr("encoding", "multipart/form-data");
                form.attr("target", "postiframe");
                form.attr("hidden", $("input[name=userID]").val());
                form.attr("file", $(this).val());
                form.submit();

                // Load new bg image on the fly
                $("#postiframe").load(function () {
                    iframeContents = $("#postiframe")[0].contentWindow.document.body.innerHTML;
                    $("#tempBox").html(iframeContents);
                });

                return false;
            });

            $("#UploadForm").submit(function(){
                location.reload()
            });

        });
    });
</script>