I'm probably completely misunderstanding what the OP was asking, I'm rather good at that. But if you want to know how to allow visitors to post comments on your site, the attached file gives an example of using placeholders for PHP scripts to acheive that.
Here is a link to the HTML output from Xara, but notice renamed to a .php http://www.john.whitham.me.uk/comment_test.php
Obviously this requires PHP to be running serverside but, as it only uses a text file for storage, it may well be achievable through Javascript clientside.
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