How to load a page in a frame?

Question

PHP

How to load requested page in iframe using htaccess and php?
We want the request for index.html to load a page with a frame containing the actual index.html.
I did this:
.htaccess

RewriteEngine on
RewriteRule ^(.*)\.html2$ $1.html [L]
RewriteRule ^(.*)\.html$ index.php?page=$1 [L]

index.php

<iframe src="<?php echo $_GET['page']; ?>.html2" frameborder="0"></iframe>

As planned, it should pass the index.php parameter from .html, which will generate a frame to .html2, which is rewritten to the main html, but they rewrite each other. Something I'm completely confused. Who will tell? Maybe there is an easier solution?