where to add <link> to css for category layout

Perfect. But it is saver to download the JS, put it in the folder and use your technique.

Thanks.

Oh I tried the xml myself before I started this topic, but didn't succeed, must've done something wrong.

Btw, it's better not to load javascript in the head. Pagespeed says this slow down page rendering.
And you can use the <script> to load it, it doesn't cause html validation errors, unlike css.