Restrict usergroups to see signatures

[COBRAws]

I want to restrict certain members to see signatures for example, what do i need to do?



I go to postbit template and find:

<if condition="$post['signature']">

but, I cant remember the code i have to replace with to exclude certain usergroups to see it.
Something similar to this:

<if condition="$post['signature'] AND $usergrpup['????] != 1">

Help please