I tried kareha message and image mode versions.
I liked message mode better, but:
I would like to have some functionalities of image mode in the message mode board. For example: password for user post deletion.

in the message mode board, all posts have a [del] link, and i guess you can delete your own messages based on a cookie? I prefer the password because of users that connect from different machines...

Also, I can't see any admin link in my site. check it out: http://www.pixelorama.com.ar/messk/ and if I type kareha.pl?task=admin I get a "Script error; no task speficied."