<!--
javascript:document.write("<iframe src='http://www.google.com'
width='100%' height='100%'></iframe>");
-->
This is representative of a generic cross-site-scripting
situation. The homepage idea is a good one, but to date it seems
impossible to break the silly security warning. From a site
aspect you just need a 'hole' to penetrate and effect your code.
oh dear...perhaps like this one:
http://www.malware.com/dload.html
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http://www.malware.com