Data isn't sanatized before being generated. For a PoC as a ad enter:
<script>alert('xss')</script>
Screenshots:
http://www.youfucktard.com/xsp/phpclass1.jpg
http://www.youfucktard.com/xsp/phpclass2.jpg
http://www.youfucktard.com/xsp/phpclass3.jpg
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