JS: Boxy, how to tween newly created dialog

I'm using http://onehackoranother.com/projects/jquery/boxy/ to create popups. e.g. my code looks like this:

JS

 $('.boxy').boxy();


<a id="popuplink" class="boxy" href="#popup" title="Sample popup">Popup</a>

<div id="popup" style="display:none">
     Some big content
</div>

The problem is that my content is a bit big, so I am not happy about how boxy centers it. I want to display it higher on the page. So I want to tween the dialog box after it's created. How do I do that. (I se开发者_如何学运维e correspondent function in documentation, but don't understand how and from which place to call it)

Added event listener to the link and created new boxy container after getting the event. Sorry for asking stupid questions