Question : How do I add "domain users" to local administrator group

We have an Windows Server 2003 Server with about 20 XP Pro workstations connected to it.  I am setting up roaming profiles and I'm having an issue where everyone needs to be a local administrator, or certain programs don't run right.  I tried going going to control panel - users, then adding "domain users" as administrator.  It appears to take it but when I go back it domain users is gone.  I can add individual users 1 by  1, but this doesn't scale well.

What is a good way to do this, either with active directory, login scripts, or some way on each workstation to add a whole group to have local admin access?

Answer : How do I add "domain users" to local administrator group

Right click my computer and go to manage,
go to Local Users and Groups
go to Group
double click administrators
select add
\domain users