This can't be done in Javascript since its a client side technology. The only thing a Javascript code can store on client's machine is cookies which can't exceed 4KB, so I guess its out of question.
You would require some sort of server side language with a database to store the comments.
~s.o.s~
Failure as a human
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Are you absolutely sure you can't use php or ASP on your server. What host is it on?
roryt
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