Session variables when global variables switched off

I am making a section on a web site which requires that visitors log-in. Log-in, password, etc are in an MySQL table. I am using (via a web host) PHP 4.2.2 with global variables turned off. Until now, I have worked with a different host in which global variables were switched on. The way it works The user logs in at index.php. When she does so successfully, index.php returns a menu of links. However, if she clicks on any of those links, which are different pages, she gets a please log-in first message eBusiness Consultant - ITP Europe http://www.itp-europe.com j.baumgartner@itp-europe.com +32 2 721 51 00