Prototype's Effect.Parallel equivalent in jQuery

I am trying to convert a Prototype slide-show plugin to jQuery. The animation function is fairly simple an intuitive: fade-out visible slide, fade-in next slide, both animations start and stop at the same time. Here is the Prototype code which I have yet to fully understand:

fadeInOut: function (a, b) {
    new Effect.Parallel(
        [
            new Effect.Fade(b, {sync: true}),
            new Effect.Appear(a, {sync: true})
        ], {
            duration: 1
        }
    );
}

I've written this jQuery equivalent:

v开发者_运维技巧ar anim = function (a, b) {
    // m_Locked = true
    a.fadeOut(1000);
    b.fadeIn(1000);
    // m_Locked = false
};

I am wondering what does Effect.Parallel do and if there is a jQuery equivalent. I also need to set and clear a locked flag which i'll use to disable buttons while the animation is running... this does not seem to work.

Yes, you're interested in jQuery.queue().

Every element can have one to many queues of functions attached to it by jQuery. In most applications, only one queue (called fx) is used. Queues allow a sequence of actions to be called on an element asynchronously, without halting program execution. The typical example of this is calling multiple animation methods on an element. For example:

http://api.jquery.com/queue/