found it :
http://www.ai.rug.nl/~dveraart/groupblocking.plsc
the thing is that you have to create the group for the script using the script group manager
now old msn groups are named categories and something else was named groups ... some confusion here
the nice thing.. is that i prefer to view my contact by status (online/offline) not by group, with this script i don't have to use the categories of msn :P
creating the groups is kinda annoying, after adding each contact , the list re-scrolls to the top and keeps showing you the contact u added already :P
i will just organize my contacts, few at a time :)
hope someone else find this useful