You are loading jQuery twice. The second loading of jQuery overrides the first and clobbers any plugins.
<script src="/jobs/public/js/jquery.js"></script>
<script src="/jobs/public/js/jquery.form.js"></script>
...
<script src="/jobs/public/js/jquery-ui-1.10.3.custom/js/jquery-1.9.1.js"></script>
It is this second jquery-1.9.1
that is not getting .ajaxForm
. Use one or the other.
Add the form jquery to the bottom of the scripts