Hmmm, you could download, install Apache, spend three hours poking it until it works, then setup PHP, go back to poking Apache, and learn how to do some absic PHP scripting, and persuade your host to install it.... or you could do this:

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<script type="text/html" src="header.htm"></script>
and
<script type="text/html" src="footer.htm"></script>

<script type="text/html" src="header.htm"></script> and <script type="text/html" src="footer.htm"></script>