I'm net to the CMS them at all. For now, I do my pages by hand. Hope that will chande soon

After the installation on a Suse 9.3 Linux (under my desk) I got the following error message after calling the index.php in my webbrowser.
"Fatal error: Call to undefined function: session_name() in /srv/www/htdocs/cmsmadesimple-0.10/lib/misc.functions.php on line 41"
I'm not shure what I did wrong?
Maybe someone can piont me to the right direction.
Regards,
Steve