CSS Fold out iframe on click? (example within)

if you go here and click on one of the XBL: links in the guys "avatar" section, it will fold out to reveal their XBL Gamercard.

Whats the CSS for that? I would like to do something similar on my site. ie. click a link and have it fold out to reveal an image/iframe.

Code:

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<div id="gamertagmenu_1521501">XBL: <b><u>WinnemuccaRyles</u></b><script type="text/javascript">vbmenu_register("gamertagmenu_1521501", true); </script> </div> <div class="vbmenu_popup" id="gamertagmenu_1521501_menu" style="display:none"><iframe src="http://gamercard.xbox.com/WinnemuccaRyles.card" scrolling="no" frameBorder="0" height="140" width="204">59</iframe> </div>

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its javascript by the looks of it :)

and here is link to the CSS

http://gamercard.xbox.com//xweb/css/...erCardSkin.css