Add if rule in the plugin

[Zi55]

Hello ,
I just would like to know how i can put this if rule inside plugin ,
<if condition="$show['member']">
include a file for example
</if>

maybe you will tell me to use is rules , is the below right ?

if (is_member_of($vbulletin->userinfo, 1)) (The group of guests)
{
//return empty result
} else {
include
}

Thanks ,
Zi5

--------------- Added [DATE]1262351928[/DATE] at [TIME]1262351928[/TIME] ---------------

Please help