Disabling submit button using jQuery

For all submit buttons, via JQuery, it'd be:

$('input[type=submit]').click(function() { this.disabled = true; });

Or it might be more useful to do so on form submission:

$('form').submit(function() {
    $('input[type=submit]', this).attr("disabled","disabled");
});

But I think we could give a better answer to your question if we knew a bit more about the context.