member list for displaying only sellected usergroups?

[Ecliptic]

hello im trying to make the memberlist page on my site only display 3 of the usergroups so that the other groups on the board dont show up in the list i would expect this is not to difficult but i am very new to vbulletin and php so im not haveing to much luck at all =\

any help with this would be great =)

thanks