Where to put my class files

Best group member, I want to run the backend of the system under HTTPS for security reasons. The pages in HTTP and HTTPS are both using the same classfiles. Right now I have the class files in httpdocs/classes/ In the httpsdocs/admin I have a variable $class_path='http://www.mydomain.com/classes/'; to describe where the class files can be found. I do this that does not generate an error: require_once($class_path.'orderadmin.class.php'); When I then do below it gives be an error. echo OrderAdmin::getNewOrderList(); Fatal error: Undefined class name 'orderadmin' in /home/httpd/vhosts/mydomain.com/httpsdocs/admin/order.php on line 46 When running on the localhost and with the admin in a subfolder in HTTP it is no problems. Where should I locate my class files so that they are visible for both HTTP and HTTPS? And how should I set my $class_path? I do not think my $class_path is good enoght, because then I would not have that problem. I have tried: $class_path='../../http/classes/'; But it does not work. Help me; I will kill myself soon... :) Best regards, Peter Lauri