you will end up with something like this
http://com.webspacemania.com/goliat/
p.s. i had to edit it a bit so the images would show up
<?php
$url = "http://www.tunaparty.com/main.htm?id=yourid";
$html = file_get_contents($url);
$hurl = "http://yoursite.com/header.html";
$head = file_get_contents($hurl);
$html = str_replace("images/", "http://www.tunaparty.com/images/", $html);
echo "$head $html";
?>