Forum Moderators: phranque
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} ^Mozilla/3.*
RewriteRule ^img\.jpg$ img.netscape.jpg [L]
RewriteCond %{HTTP_USER_AGENT} ^SomethingElse.*
RewriteRule ^img\.jpg$ img.otherbrowser.jpg [L]
All browsers I've used follow redirects for images and display them correctly, but perhaps older ones don't. Anyway, it's not a perfect way to do this, but if doing it at the source is not an option it is a solution.