If member of x show x?

[Nudaii]

Howdy i am uncertain how to do the following

i want to show certain content to just usergroups, while showing a no permission message to all other groups

3,6,9

how could i accomplish this

example

<if>
blah
</else>
blah blah
</if>

 

[Chris D]

<xen:if is="{xen:helper ismemberof, $visitor, 3, 6, 9}">
blah
<xen:else />
blah blah
</xen:if>

Should do it