problems with image upload

Hi
i have a brand new opencart installation with the latest 1.5.6.4 version installed. All requirements were checked on installation and completed fine.

After installation if i go into the products admin and try to upload a new image to a product the admin login window appear.

All required folders has 777 permissions on them.

Attaching a screendump.
Anyone have any ideas?

Please check folder permissions again. How did you set them? Using Cpanel or FTP client?

I set the permissions to 777 using a FTP client (FileZilla)...