Help in writing a conditional... if a user is not a member of usgroup 6 OR 16

[criscokid]

I need some help in writing a conditional for my template that will only show text / graphic if a user is not a member of usgroup 6 OR 16.

Using
<if ((condition="$bbuserinfo['usergroupid'] != 6") || (if condition="$bbuserinfo['usergroupid'] != 16"))>
results with this error: Parse error: parse error, unexpected T_ENCAPSED_AND_WHITESPACE, expecting T_STRING or T_VARIABLE or T_NUM_STRING in

[Paul M]

<if condition="!is_member_of($bbuserinfo,6,16)">