How to add CSRF token to a form?

[eluser]LuckyFella73[/eluser]
The form helper echoes out the absolute url. I guess you get
the index.php in between the form action-url if you don't remove
"index.php" in your config.php ( $config['index_page'] = ''; ).
I allways use mod_rewrite to get nicer urls so I don't have
that "index.php" in my form actions.