Can't get jQuery UI radio buttons working

I'm trying to setup some jQuery UI radio buttons but it's not working.

jsFiddle

HTML

<div id="type_radios">
    <input type="radio" value="option_a" name="note_type" id="note_ty开发者_如何学JAVApe_option_a"/><label for="note_type_option_a">a</label>
    <input type="radio" value="option_b" name="note_type" id="note_type_option_b"/><label for="note_type_option_b">b</label>
</div>

Javascript

$(document).ready(function() {
   $("#type_radios").buttonset();
});

What am I doing wrong? Thanks for reading.

What you have works, you just aren't including the stylesheet for jQuery UI (and in this case there's just no visual change without it), for example:

http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.5/themes/ui-lightness/jquery-ui.css

Here's your updated fiddle, stylesheet included, working :)