Anyone know how to get rid of this error:

Warning: Unknown(): Your script possibly relies on a session side-effect which existed until PHP 4.2.3. Please be advised that the session extension does not consider global variables as a source of data, unless register_globals is enabled. You can disable this functionality and this warning by setting session.bug_compat_42 or session.bug_compat_warn to off, respectively. in Unknown on line 0

turn register_globals "On", but beware..

I would just do it with a .htaccess file just for the site in question and not server wide.

php_flag register_globals on

That's all you need.

really? you mean Plesk goes through all the trouble to rewrite the .conf files and you can override it with .htaccess? damn!