Problems with Theme

If someone could help me out with this I would really appreciate it.

Ok, I have this site here:
http://www.tigerplug.com/dev

and I want to add this to the theme :
http://www.ndesign-studio.com/blog/design/css-dock-menu/comment-page-25/#comments

There are clear instructions there but I just dont understand how to set this up.

Any suggestions?