Combine fading and sliding in a neat little jQuery animation

jquery.fadeAndSlide.js

;(function($, undefined) {
    
    $.fn.fadeOutSlideUp = function(speed, cb) {
        speed || (speed = 'medium');
        cb || (cb = function() {});
        var self = $(this);
        self.animate({ opacity: 0 }, speed, function() {
            self.slideUp(speed, cb);
        });
    };
    
    $.fn.slideDownFadeIn = function(speed, cb) {
        speed || (speed = 'medium');
        cb || (cb = function() {});
        var self = $(this);
        self.css({ opacity: 0 }).slideDown(speed, function() {
            self.animate({ opacity: 1 }, speed, cb);
        });
    };

})(jQuery);