Need help with "threads starter" template conditional

[vbplusme]

In the threadbit, I have this piece of code:

<span style="cursor:pointer" onclick="window.open('member.php?$session[sessionurl]u=$thread[postuserid]', '_self')">$thread[postusername]</span>

I want to wrap a condtional around it to test if the thread starter is an administrator and add a title to the display.

Can this be done with template conditionals, if so, which one? All the ones I have tried test for the user rather than the thread starter.

I am thinking something like :

<if condition="$threadstarter = usergroupid 5,6">

for example. Does a template conditional exist for this kind of test?

TIA for any suggestions.