How to let Unregistered users upload pictures?

[nextri]

How can i let unregistered users upload pictures to galleries?

I have set the "Visitors can upload pictures" to YES in a few albums, but unregistered users dont have the "upload picture" tab in the menu, and if i try to access /upload.php i get:
You don't have permission to perform this operation.

[Casper]

You have to change the group permissions for the anonymous group.  In admin mode, click on groups in the admin menu.