Concat rows into string

I have a simple select statement - select groupname FROM Groups
This returns 30 rows. What I want is return everything as comma
seperated string like "group1, group2, group3..."
But I don't want to use function or cursor. Is there anyway? In on
SQL 2000.
thanksPlease have a look at this example:
http://p2p.wrox.com/topic.asp?TOPIC_ID=57982
Cheers,
Paul Ibison