I set my own file php.ini in CGI, I settup the session.use_only_cookies.
I used code on sides of my wiki, to conquer informations on settings php:
<php>
phpinfo();
</php>
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session.use_only_cookies is on but session ID still work.
setup php.ini in CGI:
1. Enable Shell Access in hosting. Create a new user with shell access.
2. Download SSH client: Putty; SSH Secure Shell or other client
3. Login to Shell
4. use info from side: http://wiki.dreamhost.com/index.php/PHP.ini
5. now you are able to edit your file php.ini
6. set "session.use_only_cookies=1" in php.ini