How this Tabs tutorial works?

I am trying to run this Dynamic Tabs tutorial. After i went through the javascript, i came to know that there is no, $("#tabs").tabs().

But till this time, i was using $("#tabs").tabs() to create tabs. But how this tutorial works. Can anyone explain me!?

Thanks in Adva开发者_如何学Gonce!

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$("#documents a").click(function() {
    addTab($(this));
});