[jQuery] Simultaneous or serial execution of commands within a function?

[jQuery] Simultaneous or serial execution of commands within a function?


A pretty basic question, if I have this construct:
$('#img').hover(
    function() {
        $(this).parent().parent().siblings().stop().fadeTo('slow',0.3);
        $('.popdir').hide('fast');
        $('.popdir', $(this).parent().parent()).show(500);
    }
)
will the 3 lines inside the function be executed simultaneously or
serially? Will the second line wait for the animation in the first one
to end before running?