changing filegroup

From: Leyla (leyla.garcia@unisabana.edu.co)
Date: 11/21/02 

From: "Leyla" <leyla.garcia@unisabana.edu.co>
Date: Thu, 21 Nov 2002 13:45:59 -0800

hi everbody!
I just created a new filegroup in my database and I want
to add some tables to this group. These table already
exist, so, how can I change the filegroup for these tables?
Is there any restriction?
thanks a lot in advanced for your help.