alternative var to "postusername" (like musername)

[Kurtie]

hmm, i have this command line:

<if condition="$show['guestuser']">
$thread[postusername]
<else />
<a href="member.php?$session[sessionurl]u=$thread[postuserid]">$thread[postusername]</a>
</if>

"postusername" posts only the username. i want to post the username with its tag (if it has one), something like the "musername" var.

how can i change this command line to achieve that?

thanks in advance.

p.s
this script is from the threadbit template.