This is the code I used to create the Offshore 2013 morphing on EWEA.org leading up to the offshore conference.

<div id="offshore-morph" style="position: absolute; top: 0; left: 0; z-index: 99999;"><a title="Click to register for EWEA OFFSHORE 2013" href="/offshore2013/registration/?ref=morph"><img src="http://ewea.org/uploads/pics/offshore-2013-morphing-corner.png"></a></div>

body {background: url(http://ewea.org/uploads/pics/offshore-2013-morphing.jpg) 100% 0 no-repeat #005596; position: relative;}

You will need to edit the main template file as follows:

[root@main]# cd /var/www/html/sites/www.ewea.org/fileadmin/templates/fluid/layouts
[root@main layouts]# vi Home.html