Your question makes a little sense, but it is not exactly clear what is your underlying rationale and goals:

• do you intend to serve the html over the web or just open them locally on your own machine?
• do you intend to use msft FrontPage extensions in your pages or just using that because it is the only tool you have available?
• are you using this variable interpolation method because you do not want to use any of the myriad templating solutions already out there?

Absent a better understanding of why you are going this specific path, please take a look at Template Toolkit. It seems as though you are trying to re-invent it, or something similar.

http://www.template-toolkit.org/

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