[jQuery] stop jQuery Form Plugin from being submitted multiple times.

[tristan]

I'm sure this is very simple, I'm quite very new to JavaScript. I have
a function for submitting a form, I'd like it to stop the user from
submitting the form multiple times once they have clicked it. I
haven't found a way to do this in the docs. Can anyone point me in the
right way?

My function looks like this:

function submitComments(id, numComments) {
    $('#response-'+id).fadeIn('fast');
    $('#commentForm-'+id).ajaxForm({
    target:        '#response-'+id,
    success: function() {

                loadComments(id, numComments);
                $('#commentValue-'+id).val('Speak your brains! ')

            }});

}