If your using PHP, use this code

Code:
<?php 
$main_path = "./";
echo '<html>
<head>';
include($main_path . 'folder/metas.php'); // make a metas.php  with the specified codings.
echo '<title></title> </head>
?>
if that one is to hard check this one (Simplified PHP)
Code:
<?php 
echo '<html>
<head>';
include('folder/metas.php'); // make a metas.php  with the specified codings.
echo '<title></title> </head>
?>
metas.php will look like
Code:
<?php
echo '(MEta tags here)';
?>

If your using normal HTML, you will have to put them in every frame.
Code:
<frameset src="google-search.htm" width="x" height="x"></frameset>
Each specified <iframe> or <frameset> page will need to have the meta tags in them for them to work properly, this is one advantage using php.


If footer.html doesn't have a search engine in it, don't add it to that.
If header does not have a search engine don't touch it.
If contents has the search engine, add it to the main page where the framset is, or in the contents page.