A reminder to myself about how to mark up wrapped checkboxes when they change ... could do with being cleverer, I expect.

mark_checkboxes.js

$('input[type="checkbox"]').live('change', function(evt) {
    var $this = $(this);
    var $parent = $this.parent();
    if ($this.attr('checked') === true) {
        $parent.addClass('selected').removeClass('unselected');
        return true;
    } else {
        $parent.removeClass('selected').addClass('unselected');
        return false;
    }
});