Profile fields visibility based on usergroups

[R34GTT]

In detail I have a custom profile field shown in the post bit, and I only want this field to come up if they are in a certain usergroup, and if they are a registered user it doesn't show.

--------------- Added [DATE]1228180875[/DATE] at [TIME]1228180875[/TIME] ---------------

I just need simple code to put in the postbit.

On the lines of "if usergroup 'x','y','z' $show[field'x']"

I just need someone to write it out for me so I can add it in if possible