Re: Need to add server side include... on every page.
The purpose of CSS is to provide styling or positioning for the site content, not to provide the content itself.
To provide the kind of random content you're talking about, you don't need to go outside of Tiki to some other script, etc. Tiki itself has the functionality already in its "Cookies" feature. Not to be confused with web browser cookies, this feature actually means the "fortune cookie" kind of cookie, i.e., random bits of wisdom displayed one at a time, which you can program with whatever text lines you like.
The admin page for the feature is tiki-admin_cookies.php. The doc page is http://doc.tiki.org/Cookie .
I'm not sure just where you want the text to be displayed. The cookie syntax can be used in any wiki text (wiki, blog post, etc.) or in a module, which can be in any of the module zones. Post again if you need any help in that regard.
-- Gary