[jQuery] jQuery Form Plugin (jqForm) problem on beforeSubmit callback

[jQuery] jQuery Form Plugin (jqForm) problem on beforeSubmit callback


My question is pretty simple... I have the code posted above and it
doesn't work. To test the problem, load the page (of course lol),
click on "Submit" and you'll see a message stating what the script is
going to do next, then, click on "Show!". You'll see the value "null"
and I don't understand why, I think it should have been "Hello World".
The code:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/
TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>jqForm Test</title>
<script type="text/javascript" src="libs/jquery.js"></script>
<script type="text/javascript" src="libs/jquery.form.js"></script>
<script type="text/javascript">
    (function($) {
        $.admin = {
            init: function() {
                $('form#form-login').ajaxForm({
                    beforeSubmit: this.ajax.request
                });
            }
        }
    })(jQuery);
    (function($) {
        $.admin.ajax = {
            someVar: null,
            request: function(formData, jqForm, options) {
                alert("Setting someVar = Hello World.")
                this.someVar = "Hello World";
                return false; // we are testing, don't really need to submit the
form
            }
        }
    })(jQuery);
    $(document).ready(function() {
        $.admin.init();
        $('input#show').click(function() {
            alert("someVar: " + $.admin.ajax.someVar);
        });
    });
</script>
</head>
<body>
    <form id="form-login" action="index.php" method="post">
        <input name="internal" type="hidden" value="login" />
        <strong>{FormLabel:Username}:</strong><br />
        <input name="login_username" type="text" size="25" /><br />
        <br />
        <strong>{FormLabel:Password}:</strong><br />
        <input name="login_password" type="password" size="25" /><br />
        <br />
        <input type="submit" value="Submit" />
        <input id="show" type="button" value="Show!" />
    </form>
</body>
</html>
If I replace:
this.someVar = "Hello World";
With:
$.admin.ajax.someVar = "Hello World";
It will work, but this makes no sense to me. I should be able to use
this, that's what makes sense on my head... What am I missing?