twitter style updates

Question

How to create this effect where it looks like a newly inserted update shows up at the top of the stack and pushed the rest down? This is how it is done at the twitter home page.

Update.

In case this isn't clear, I am trying to understand the whole effect of how the uipdates section is animated and updated with the smooth scrolling effect, including the animation.

Answer 1

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UDPATED:

// The following code is untested.
// But should give you an idea of how it could be done.
var container = $("#tweetContainer"),
    speed = 250;

$("<div class='tweet'>1 new tweet</div>")
    .hide()
    .prependTo(container)
    .show(speed);

container.children(".tweet")
    .eq(-1)
    .hide(speed, function(){
        $(this).remove();
    });