1. In HTTP, the headers and content are separated by an empty line. The "Location:" bit is supposed to go in the header, but because you have a "\n\n" printed out before it, it ends up in the content, and doesn't have the desired effect. I think you already figured this part out.

2. To show something on the browser AND send data to another URL is not something usually done with a redirect. For a server-side solution using Perl, look into http://search.cpan.org/perldoc?LWP instead (lots of documentation and examples if you look around).

3. Another option is AJAX, which is done through Javascript (not Perl). Some find this simpler, but it does rely on client-side technology, which has its drawbacks.