Hello cgraz,
Let me clear a bit. Lets say a user bookmarked www.yahoo.com. And a visitor see and click that link. I want when yahoo page shows, at the top "if you like this site bookmark now" message appears.
For doing so I manipulate the direct link to yahoo to go.php?url=www.yahoo.com
in go.php
<?
echo "<a href=my-bookmarking-site>if you like this site bookmark now</a>"
require ("$url");
?>
Everething goes ok but the relative links and images at Yahoo page seems broken. So I can not edit the target pages.
I hope you have wonderful solution now 🙂